Wow , you all are pretty slow when it comes to the Bible.
I guess you all have never heard of reading something in its CONTEXT.
To answer a few of your supposed contradictions:
There is only one God, but if you read your Bible, you'll find that there is a Godhead consisting of GOd the Father, GOd the Son and God the Holy Spirit. They are all one God, just different aspects of His nature.
Cain's wife was obviously a sister or cousin that was not mentioned by name in the Bible. This is not advocating inbreeding, its just that under the circumstances, this was the only way to multiply.
Yes people lived hundreds of years, but because of sin, the life expectancy came down.
No God cannot tempt.
God knew where Adam was, He wanted Adam to acknowledge the fact that he had sinned by revealing himself.
Enoch and Elijah went to heaven before Jesus. In the New Testament , Jesus is talking with them during the Transfiguration.
Here are just a few examples of what happens when skeptics don't do their homework. Its easy to point fingers when you yourself don't even understand what the Bible says.