The Bible tells us that God has always existed.
Then, at one particular instant (5000 years ago if the Bible literalists have it right, 13 billion years ago if science is right) He suddenly decided to create the heavens and the Earth. Somehow those two statements don't fit together for me.
Then, people were created so that they could live an insignificant (in comparison to infinity) life to prove themselves worthy of life after death (as opposed to eternal punishment).
Humans were created seperately from animals, yet there is a huge overlap of genes between humans and apes.
God created the entire universe, but gave special treatment to a particular tribe of people in the ancient Middle East. For thousands of years the rest if the world was allowed to live in ignorance, incapable of salvation. That proposition seems suspect.
God has absolute power of life and death over everyone and everything in the universe. Yet he requires people to enforce His law. Why should He leave such important decisions to imperfect humans? Or are they important decisions?
I'm sure there are more ponderables along these lines.