Most any server will tell you that the after church crowd is the worst.

Also, I don't think the guy that drowned a whole planet gets to be the good guy.

Ever.

And how come the worst injustices against humanity that I know of often involve religious leaders and not public school teachers?

In the battle of knowledge vs. religion, they believe religion is better and should replace knowledge.

The exact explanation is that people will only be dumb enough to believe in fairytales if you keep squeezing it in their brains from as young as possible, from the moment they're able to understand anything at all. There needs to be a constant feed of the fairytale, and anything competing, like science and reason and independent thought, must be kept out at all cost or these kids may start seeing the actual light of reason.

Can't have that happen, they might realize that their political system is just a dictatorship from the rich dressed up as democracy, can't risk that.

They’re only concern is forcing their “morality” on others, not improving themselves.

Teaching about god in public schools might actually improve morality, if it is done from a neutral outside perspective. Something along the lines of "These are the major organized religions that are relevant today or were relevant historically. Let's compare their societal effects across different regions and times."