"How do you know god said so? How do you know there even is a god? How do you know god wouldn't lie?" I don't know any of these things. I don't believe in a Go

"How do you know god said so? How do you know there even is a god? How do you know god wouldn't lie?" I don't know any of these things. I don't believe in a God. But you're missing the whole point which is that just because you disagree with the reasoning and beliefs of Catholics doesn't mean that you can impose a doctrine upon them which they do not believe. "And that's blind faith, because they can't actually prove it, they just declare it's possible." They believe that they can prove it, and I've met many who will attempt to a do so at the drop of a hat. If you'd read the link I provided you'd actually see some of those attempts. Whether they actually can prove it is beside the issue, however. What matters is whether they believe that their proofs are valid.