Why do people think God is perfect and doesn't make mistakes?

Par5 said:

In Genesis 1:31, god was delighted with his creation. In Genesis6:6, god regretted his creation so much that it grieved his heart.
Do these verses not call into question god's supposed omniscience?
Why would a being that was supposedly omniscient, and being omniscient have known that things would turn pear-shaped and that he would end up destroying his earthly creation?
And why would a supposedly omnipotent, omniscient being feel regret and grief so much that it broke his heart?
It just doesn't make sense.
As for poor old Adam and Eve getting a bad press. Surely they were two innocents who had no idea about right and wrong and did this omniscient being not realize that crafty old lucifer would be in the mix stirring things up?
As I said, it doesn't make sense!

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