Well, let's take a look at the earth. Everything works together in this world....and so, SOMETHING intelligent must have been behind this, and not just something that's random. I mean, the way trees work in the environment and give off oxygen and take in carbon dioxide...the way the atmosphere on the earth is just right for animals and humans to breath, every single creature is unique in their own way....so obviously there IS something superior that's made all of this. Well, since you say God has to be a possibility, we're gonna make him the top possibility right now.
So you say you believe in "God." Well, there's only ONE, TRUE God that created everything...Genesis 1:1 says "In the beginning, God created the heavens and the Earth." and the God in the Bible is the God Christians believe in...no other religion claims that their god created the heavens and the earth. Most (reason I say most is because Mormons and I think Muslims say that the earth was created) religions don't even say A god created everything...they don't even touch it. Christianity is the only one that says something intelligent, aka God, was behind the making of everything, so that's fairly significant, I think.
So if that portion of the Bible is true...what about the rest of it? Can the rest of it be trusted? I think so. Reason I say that is because, why should you trust something you can only half-believe in, or even a little more than half-believe? And if you truly read the Bible cover to cover, I think you'd get your answer.
Just to note, I'm not saying that God is real because the Bible says so. I'm giving you some things to think about, though...giving you some comparisons and stuff...
I hope what I said makes sense