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

[Mister Agenda]

Again, thanks for all the informative responses. I know atheism isn't something we choose to be or give a shot, and the reason I've been having atheistic thoughts is mainly because I never questioned my faith too much, and now I'm losing confidence in it. Obviously my conscience is conflicted here, as I'm so used to firmly believing in my faith. I'm worried that I'd be sinning and doubting God too much...but at the same time, if God isn't real, then it doesn't matter at all.

I'll see to responding to some posts.

Well, it doesn't matter based on God's feelings if he is imaginary. It still matters based on your own feelings and the feelings of those around you. Atheism wouldn't be much of an excuse to be self-destructive or hurtful to or exploitive of others, for example. Everyone without brain impairment has a conscience, regardless of which religion they follow or whether they don't follow any.

If you stop believing in God, you'll have to figure out what's a 'mere sin'...not wrong in itself or because of the harm it causes, but just something that you've been told displeases the deity you were raised to believe in...or if it really has bad consequences or undesirable consequences in this life.

Moderate drinking (or other legal vice), probably okay. Excessive drinking, probably not okay.

If you're concerned about your behavior if you deconvert, you might want to check humanist moral philosophy.