Why do Christians make God out to be dumb?

If God inspired the Bible, and laid down all the laws therein, then explain the revolting behavior required by a strict observance of Leviticus 20. Pay particular attention to the punishment of death for the "sin" of adultry as prescrivbed by Leviticus and how Jesus handles adultery by simply telling the woman "Go and sin no more".
The Old Testament depicts a God that at times is not only incompetent but sadistic and brutal; certainly not a God of a loving nature.

Do you have another interpretation? It seems straight forward that anyone caught in adultry is to be put to death. The same goes for homosexuals. So how come if this is the word of God jews in Israel aren't stoning people to death for adultry and homosexual behavior. Could be that we have advanced beyond the crudeness of the Old Testament which appears to be written my humans that certainly aren't inspired by God.

If God inspired the writers of the Old Testament then God did a poor job of inspiring. Killing people for acts that should be handled in a civil manner, allowing slavery, destroying whole populations, including children, is not my idea of a benevolent God but of a psychopatic personallity.
If the entire Bible is inspired by God then God obviously never took a course in Composition 101. God requires some 1,217 pages to explain what could be writen on a postcard.
It has never ceased to amaze me what people are willing to believe and consider the word of God. Place any of the statements made in Leviticus 20 in any other context and people would be appalled. Religion should show humankind how to live justly and in harmony with one another and not concern itsself with where we came from (Creationism) but where we are going. It should portray God as successful and not the miserable failure of the Bible who craves attention, devotion and sacrifice. A God who would have taught Adam and Eve the difference between good and evil and given them the teachings of Jesus day one and not some 4,000 years later.
The God of the Old Testament is a fabrication of primative minds and can't begin to compare with the sayings of Jesus. If one calls himself or herself a Christian then it behoves them to concentrate on the New Testament, and in particular the words of Jesus, rather than the rambling violence laden nonsense of the Old Testament.

Exactly. What you see is written by man, not God. Killing and slavery are not acceptable in any age. There is nothing in the Old Testament that is worth holding as holy. The New Testament works just fine without the embarassment of the Old Testament.
Placing the ramblings of the Old Testament on the same level as the sayings of Jesus is ridiculous and the mark of someone that really doesn't understand Jesus and what he was about.