If we take the Bible as Perfect and Infallible the following facts are true.
God is complete and perfect. He has no needs. - God Has a Need to prove himself. Story of Job
God could have eradicated all of creation and started over, but He didn't. - THE FLOOD.
I could go on and on and on, the assertion that God is Perfect and that the Bible is infallible are Incompatible facts. Logic permits one fact or the other, Not both.
I'm sorry but if the bible is true then you cant just ignore the parts you don't like.
I don't ignore anything.
God wasn't proving Himself to Job; Job was proving himself to God.
The flood did not eradicate all of creation. One family was preserved, which also preserved the curse of sin. If God had intended to kill every living thing, He wouldn't have needed anything as elaborate as a flood, nor would he have sent warning or provided time and resources to build a boat.
A much more difficult paradox that assumes God's existence is this:
God is all powerful
God is good
Evil exists
Wrap your brain around that if you can.
You've got your own paradoxes to deal with, though. For example, if the universe wasn't created, wouldn't you have to believe that matter is eternal and can be eternally recycled between physical form and energy?