If God knows eveything then why pray???

God sees the big picture. He knows what’s happening around us and ahead of us. We, however, are limited in our understanding. At times, we are like the child who only wants donuts for breakfast and candy for dinner. The parent knows that, although one day of having a diet like that won’t kill us, to continue in that pattern would be detrimental to our health.
The Bible is very clear that God is omniscient, a fancy word for “all-knowing.” He knows everything from beginning to end. He even created time, so He’s not limited by it like we are.
When we seek God for wisdom about our lives, He will speak to us. As the Bible says in James 1:5, “If you need wisdom, ask our generous God, and He will give it to you. He will not rebuke you for asking.”