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

[Aoi Magi]

The thread on the catholic side seem to have quite a few misconceptions about what atheists "believe". Maybe these threads cannot be linked, but I can read it as long as it's public, so...

how did existence come into being? Catholics believe God has always been, from eternity to eternity, but how do atheists explain that? Without a supernatural being there from eternity, there is nothingness, how does something come from nothing?

Atheists don't explain that, atheists admit they don't know those answers yet and are actively seeking those answers instead of making things up. Just cause one believes something, doesn't make it true, and just cause one claims to have an explanation, doesn't make that explanation correct.

God, first of all, chose to create the universe, the world we live in, all the creatures that live here, and the human race, He chose of His own free will, with no obligation whatsoever, no need to create anything, because He Himself is perfect, and perfectly happy, and had no need of anything, however, God is not predictable, and we do not understand His ways

If we do not understand, then why make claims and assertions about Him, instead of trying to understand?

Have you ever looked into the miracles of the church? Perhaps those would give you something to hold on to, for example, the incoruptable bodies of the saints, the miracle of the sun at Fatima, Our Lady of Lourdes...there are countless miracles in the church, but those are a few which have been(and are) witnessed by the public, believers and unbelievers, which no one has ever been able to explain away

Incorruptible bodies of saints
Fatima predictions
Our Lady of Lourdes

And a bunch of other miracles...

There is a distinction between faith and knowledge. One comes from authority, the other from direct experience. There are certain things which in this world can only be accessed by authority... It is not satisfying to the intellect which has not yet humbled itself, because we really want that direct experiential knowledge. But this sets up an exercise in futility. It is only when you are willing to admit openly that you can't demonstrate this or that but are willing to trust the witnesses to those things that the restlessness will decrease.

Faith comes from ignorance, not authority. You can have faith your friend won't reveal your secrets to the teacher, and you have that faith not because of your authority but because you don't know enough about him to be confident, you know just enough to partially trust him. Trying to gain knowledge isn't futility, blindly trusting witnesses to determine the truth is futility. That's why we have so many religions with their individual list of witnesses and contradictory assertions, because some people are too lazy to actually verify the truth for themselves.