Religion's not like anything else, though. It's usually the result of indoctrination from one's earliest memories, something taught long before one develops the ability to reason. It's not about reason, anyway, it's more about what they want to believe, what gives comfort and solace.<br />
And that's probably why people become so irate when it's challenged.
It's not illogical to believe in things without proof - much of what we hold to be true we only have evidence for - which is not the same as proof. So for some there is sufficient evidence to believe in god in the same way that others consider the weight of evidence and believe there is no god. Some consider evidence and believe there is life on other planets, others do not. Neither position is necessarily irrational.
nobody has "proof" of how the universe came about. but we all have our different beliefs on how it came about.
Because they're simpletons and/or afraid of "going to hell."
They call it faith...