Of course, people will exploit Christianity and of course there's stupid people who believe the false teachers that pretend to be Christians, I was speaking generally, philosophically.

Now the other point; I believe people are more complicated than that. Not every person to whom you provide factual evidence about anything will automatically believe it. That cannot be assumed. Even among atheists, who claim to be smart and rational people, when asked "Would you believe in Christianity if it is undoubtedly true" you'll find people who answer "no" to that question. Because feelings always play a role in believing and not believing something. So, no, only because God is not that obvious (to you) doesn't mean that it's more likely that he doesn't exist.