It doesn't make sense though why God who knows the future would make a world that he knows will be bad. I don't see proof that the God of the Bible exists. The Bible is not clear and is confusing. Christians don't act like they really believe what they are saying. Between the Bible not making sense and Christians not acting like they really believe what they say about God, I don't see a lot where I want to be a Christian. It just doesn't make sense why God allowed the world to exist as it does if he is as caring as people say. Why is there eternal pain for people who God created and knew how their lives would go?
While I don't think it wise to even suggest we can understand His ways, I think it to be the most prudent choice is to believe in Him.
First, you do not know all the Christians, so making that call seems a bit broadly brushed.
I will agree, however, that choosing God based only on our human behavior is not such a good idea. Our choices often point to satan and our own devilish ways. If we really look at humans capacities, though, with Him leading the way, wow, that has God all the way.
Creation, our existence and the rest of nature, is intelligent by design. Looking at this Christian, myself, I know the difference He has made inside. If you could see the mess I was, not believing, to the less messy I am because I believe in Him, you'd have visual proof. You taste Him for yourself and see that He is good.
So you see...not believing in the God of the bible and or the one living in my heart, the one now helping me breathe the breath of His, makes zero, not one iota, sense to me. I don't believe because I have to but because I get to. You have the same choice. I highly recommend you pick the right One, He is the only way, the truth and the life, nobody gets to God without Him.
He is available to your knowing, as well, but you must stop the pondering on His existence and start pondering on His ways. Dig in, there is plenty to fill your heart and mind's belly.