My experience is that most Christians haven't read more than a few selected verses.
Indeed.
As a matter of fact, I'd say that most Christians follow Christianity in precisely the same way they cheer on their local football team. It isn't about actually knowing anything. Half of them don't even know what it is they're supposed to believe beyond "Jesus Loves Me" and he died on a cross for "our sins." They just know that they believe it unquestioningly and repeat those tidbits over and over.
Personally, I like to talk about the role of human sacrifice and cannibalism in the religion, but they don't like my take on it much.
But if you were wondering... I read a lot of C.S. Lewis back in the day, and this was close to the time that I abandoned Christianity at approximately age 10... somewhere between 10 and 12, anyway, but 10's a nice, round number. Lewis had little to do with it. The Bible itself and Robert A. Heinlein's "Stranger in a Strange Land" were greater influences, but overall, it was mainly because I finally realized that the very core of the religion was rotten. Seems nice and juicy on the outside, but rotten at the core.
The main thing was about Abraham being willing to kill Isaac as a human sacrifice... and the religion portraying that as a good thing. Combine that with God supposedly doing the same damn thing to his own son (but this time following through with it) and well... seriously. You can't see how inherently evil that is? There's nothing ethically redeeming about the whole damn thing. The story itself is reprehensible once you back off of the emotional poignancy enough to see it from a modern perspective.
The only way you can cast all that in a seemingly good light is with a completely authoritarian, grovelling perspective. I don't bow down to authoritarians, regardless of their supposed power... especially not if they're obviously, reprehensibly, wrong. I won't worship your clearly evil god, regardless of the consequences. Lucky for me, I'm pretty sure it's all nonsense, anyway. It took a few years of being willfully damned before I came to that conclusion, though.
There were other passages that hit me as ethically questionable along the way, but those are the most well-known ones, and I don't even know anymore what triggered my first round of sanity that extracted me from the cult. It might have been Job, but I don't remember anymore. All I know is that I read the whole damn Bible front to back before putting it aside for good.
Once you are able to put aside the grovelling authoritarian mindset and take responsibility for your own conscience instead of delegating it to ancient nonsense, there's quite a lot in that book isn't remotely morally acceptable to the current generation of humans. That I know. But since most don't bother to read it critically, the religion continues on. I guess that's okay in a way (mostly harmless), but I don't personally endorse it if you couldn't tell.
I do, however, wholly recommend reading the entire book front to back -- independently, with no one guiding you to specific cherry-picked passages -- before trying to pawn it off onto the next guy. Doing just that creates a lot of newly-spawned atheists and agnostics, but that's not a bad thing from my perspective. And at least then you'll know what you're endorsing. The tedium eventually cleanses away the socially-induced piety enough that you can think critically -- or at least that's my experience. Once the church-induced social pressures are put aside and you're left alone to think for yourself, you can see it for what it is, and it's not particularly pretty.
Yes, I know that most of this is largely irrelevant, but I'm a crotchety old geezer that likes telling long-winded stories. Mere disagreement is too bland to bother posting. But yeah, I also noticed fairly early on that The New Testiment predicted the apocolypse within the lifetimes of those who were currently alive when it was written. I found that rather confusing, but wasn't entirely sure that I was reading it right. I didn't get that from C.S. Lewis, though. I read it in the original source (but admittedly not in the original language). But by the time I noticed that feature, I didn't consider myself a Christian anymore, anyway.