Take a good hard look at the old Soviet Union, a land that fought to eradicate faith in anything other than the state for decades. Looked like hell on earth to me: gulags, secret police, and half again as many people killed by the state as Hitler managed to wipe out. In the end, though, it's irrelevant. I believe God exists because the evidence spread throughout creation indicates the presence of a Creator. Just like, when I see a grandfather clock, I believe in the person who constructed it.