That would be true only if there were only two possibilities - either the religion you choose is right or there are no gods. That's a false dichotomy. What if the true religion was one of those destroyed by Christianity? In that case, the gods would probably be more displeased with you than with an atheist. Or what if it was one of the many variations of Christianity other than Catholicism, especially one of those destroyed by Catholicism as heresy? Throwing your lot in with Catholicism would leave you worse off again.
Circular reasoning. You interpret your god into the universe because you believe in your god and then claim that as evidence of your god. Obviously circular reasoning. You do not see intelligent design. You interpret it into what you see. And then you interpret your god into it. There are as many creation stories as there are religions - even if some god or gods had done the designing, what evidence do you have that it was yours?
No, you wouldn't. Religion is not morality. Religion is amoral. Morality is about doing what is right, regardless of what you're told. Religion is doing what you're told, regardless of what is right. Do you regard slavery as moral? Do you regard mass murder as moral? Do you regard torturing people to death as moral? All those things can be, have been and in some cases still are being done as part of religion. There is no morality in religion, only obedience.
Which is one of the reasons I am opposed to religion.
EDIT: I could have saved a bit of time by referring to the fact that your position has been proposed many times before and is most famously (at least in this part of the world) referred to as "Pascal's Wager". You can easily find out why it's wrong by searching for that term.