Atheists, tell me, a Roman Catholic: why should I become an atheist?

[Esquilax]

It's been quite a while, so I should probably pop in and mention that I'm still looking into the validity of religion, though I've toned it down over the past few weeks due to various reasons. Tomorrow I'm planning on setting aside a lot of time to focus more on the facts and the "strongest" theistic arguments, now that I've gotten a clear picture on the general perspective of atheists and theists.

Can I just say, I think it's kinda grim that the first thing you're reaching for when it comes to support for theism is arguments, and not... you know, evidence?

Arguments are not evidence, and in fact in cases like this they're most often what people use because they don't have evidence. Theistic apologetics largely just try to arrange gaps in knowledge into a god-shaped hole because they don't actually have anything to fill it. Why god must exist, because they have nothing to show that he does.

And here you are, buying into it. My suggestion to you would be to raise your standards.