Inexplicable things about "Evil"

(Has spoilers)
The "Evil" television show was pretty good about explaining a few things that people consider supernatural in terms of scientific possibility, like the firestarter kid (storage of flammables in her room), stigmata (the disgusting blowfly that burrows under your skin, injuries caused by a wheelbarrow) and so forth.  What defies explanation are the characters themselves.  
I've seen several things that baffle myself and other viewers:
*For a "Fair and balanced" program about religion, why are they depicting an atheist as a completely amoral hedonist?  I know from experience that many atheists try to be good people and there's been a few times they've shamed me with their model behavior.
*Again, for a "fair and balanced" show, an exorcist tells a Muslim exorcist to "stand aside" and succeeds where the other guy couldn't.  Not complaining, but I'm constantly trying to understand who the target audience is.
*Amazing how long the show went on without mentioning Kristen's husband at all.
*They took way too long to uncover the murder.  Once we found out it wasn't a hallucination, I kept thinking that the police had failed at their jobs.  We went through long stretches of story without any mention of the murder taking place.  The only thing I can come up with to explain the situation is that Leland has been protecting her the whole time, due to the fertilized egg thing.  The cop basically tells Kristen "The guy was a dirtbag, so hide the evidence and I'll give you a free pass on murdering the guy in cold blood."  Where is the rest of the police department?  Certainly someone else exists in the department who is capable of putting two and two together.  It's not that common to see a person bludgeoned to death with a mountain climbing pick.  The wound wouldn't conform to the shape of a regular blade.  Also, there's untapped potential in Leland somehow uncovering proof of the murder, but he never says a peep about it.
*It stretches credibility for David to get pulled over so often that he has a whole library of cop videos.  I suppose it's more possible than other things in the show, but it's a little ridiculous.
*What did Kristen see in that Satanist guy?  He just seemed like a weasel.  Was it just that he didn't really believe in anything, or that he talked about her anatomy?  And how did the IRS agree to close that Satanist church?  I thought the whole decision seemed a bit flimsy.  Maybe the Mormons said something?  There's a bunch of those types of "churches" of Satan that actually exist, and probably get tax exempt, and nobody says anything.  It would have been better if they had to evaluate a group that was "way out there" and you could see how a real cult maybe got evaluated.  
*Also, wow, they know about the Church of the Subgenius?
*That's a good Psychologist Kristen has.  Even in couple's counseling he keeps the murder a secret, especially in regards to her violent outburst at the supermarket.  You'd think he'd at least bring it up with Kristen again.  Of course, I guess it makes sense that he would do something else illogical, like using Satanic rituals to write a book.
*There's several cursed objects that make a brief appearance in the show, and nobody ever talks about again, like the diaries Leland gives the girls, the cursed tea set, the virtual reality game, etc.
*Where did Sheryl's money idol thing come from?  Why did she ever think that was a good idea?  Who gave her the idea?
*Can someone explain Ben's girlfriend?  Did she suddenly self replicate into twins?
*What's with the succubus?  Is she some representation of Ben's girlfriend?  They seem to share a lot of similarities.
*Is Leland really possessed, or not?  Why did he get the shakes?  Was it from one of his IV's full of peanut butter?  Why did he make real signs of possession, then stop after he bathed in blood?
*How did trading blood with people become peanut butter injections?
*What happened to the woman Leland had tied up in the closet?
*It's amazing that Kristen can afford all that stuff she has when she's being paid by some Catholic priest/church/organization.  I know Catholic churches look fancy, but there's a lot of money going out, and a lot of them have budget problems.  I've been to a few church budget meetings where they had to cut this or that program because they aren't doing that well.  I guess we're just supposed to assume that the Vatican thinks it's a good idea to pay a skeptic investigator an architect's salary.
*For a woman who has to use a fertility clinic, she sure has a lot of kids, and it seems like she only had to use the company for one child?  On the other hand, she has a lot of unprotected sex for a woman who's fertile, and completely rational.  Doesn't she have enough kids?
*Okay, so the evil fertility clinic was responsible for Kristen's middle child, but does she really have a long ropey dinosaur tail?  Or is that imaginary?  If real, why has Kristen never noticed it?  Did it just pop out of her during puberty?  Also, does the child actually have fangs?
*What was the deal with Kristin's husband meeting all those demons inside the unfinished wing of the house?  They just left you hanging.  Are they supposed to represent all those people at the baby shower?
*What the hell was the goat man supposed to be?  Was Leland and Kristin's mother hallucinating?  
*Did Leland really cut off a human being's head and stick him in a pot, to serve to Sheryl for dinner?
*What's in those glass jars?  Peanut butter?  Brain matter?
*Did Sheryl really drill a hole in someone's head to get the peanut butter, or is that a hallucination?
*How did Sheryl go from being scared out of her wits and bound and gagged while getting another guy's blood pumped into her from an IV to dancing down a hallway without a care in the world?  Is she just "feeling" the old guy's blood?
*Why did Kristin choose to live under a train track?
*Making out with the guy while he's wearing priest robes?  He has no decency.  He didn't even say "Wait a minute, let me change" or anything.
*Who paid off the UFO witnesses and why?  
*Why did the UFO smell like cotton candy?  Were they Killer Klowns?
*Why does Sheryl keep getting involved with Leland when she hates him?
*What did Sheryl see in Leland in the first place?  The guy is a creepy sociopath, and she somehow couldn't get enough of the guy.  He didn't even try that hard to hide how evil he was.  The only explanation would be that she'd been influenced by the powers of darkness.
*Kristen's kids are like mindless drones.  They fall for any evil scheme and blindly accept anything that normal people would find sketchy and suspicious.  Well, when they have a personality at all.
*Nobody besides that one cop and maybe the daughter said a peep about the murder.  You'd think Kristen's close friends or husband would suspect something.  Oh, wait.  The husband waited a super long time to even ask if Kristen had slept with David.  
*How long was Kristen's husband trapped in Leland's prison room being pumped full of drugs?  Was he always there?  Were those videos always fake?  Did he never go to the mountains at all?
*Was that seance with Ben's girlfriend fake or real?
*How come that non-Amazon Amazon company doesn't show up again in the story?
*What happened to that demonic virtual reality game?
*What's the Vatican's connection to the evil fertility clinic?
*The show answers what happened to Kristen's last egg, but I'm not sure what happened to the lady that bought her eggs.  Was she killed or kidnapped?  Why does nobody wonder where the woman went?  They just see Sheryl at Leland's place and believe the woman's not there, and that's that.
*Is Goat Man still coming after Kristen in the cornfield?
*What's up with that sigil map and why do they only care about it part of the time?  What's the purpose of that thing anyway?  Why doesn't Leland care about it anymore?
*Is the Ifrit/cigarette head man really real or just a hallucination?  Why does Leland see it?  Was that really a result of the exorcism?
*Are all those demonic things real, or just hallucinations?  Specifically, the ones in the new wing of the house?
*Bishop Thomas seems unusually gullible, believing Leland is possessed and setting him with David as a spiritual adviser.  He doesn't even question it.
*Why does Kristen scar herself with a Rosary every night?  I don't think they ever explain.  And boy do those self inflicted cross scars heal up quickly.
*When Kristen comes in the evil fertility clinic the first time, a clerk volunteers information and calls the place "horrible," but the second time the clerk is gone and Kristen has to get a court order.  Did the disgruntled employee get fired?
*Kristen is deeply affected by the exorcism, says every line the priest told Leland to say to cast out his demon, it looks like she's converted to Christianity, but in the next scene she's talking to David about the placebo effect and doing a Buddhist ritual with her husband.  Okay, so this is more plausible than the other weird stuff, but it's still weird.
*"The Elevator Game".  Where IS this building?  How can the sub basement be that immense and not have some alternate route outside?
*Kristen:  Are you going to tell me that I need Jesus?
David:  No...
David, what kind of Christian are you?  You didn't even predicate it with "I would, but I already know what you'd say about that..."
*A lot of times, sermons on fictional TV shows are weird.  I expect that from TV.  I think the thing that bothered me the most was how David's superiors criticized his sermons.  If they'd mentioned how David never talked about Jesus once, they'd have a valid argument.  But instead they complain about him speaking on the subject of race, and don't bring up the topic of Jesus at all.  Regardless of your opinion of David's sermons, it would have been nice to at least mention the topic, to keep it balanced.
*Why did Kristen have a vision of a frog monster coming out of her belly?