Does the Christian God know His own future and is He unable to change that future?

If the Christian God is omniscient, He knows everything, and if He is omnipotent, He is all powerful. But these two statements seem to be contradictory. So if a Christian believes that his/her God has these two attributes, aren't these two attributes contradictory as well? Below is why I think they are contradictory: - If God is all knowing, God is able to know the future of every human being and also of Himself. - But if God knows precisely what He will do at any point in time, does He still have free will? - If God is all powerful, could He make a choice at any particular point in time that is **not** determined by His omniscience? ---- @GratefulDisciple transferring OP's comment to the Q for more context: **Note**: This is a question on theism in general, and **I'm interested in a Christian answer to help me with seeing the logic** in holding two seemingly contradictory attributes while preserving God's own free will. I pose this question with a great respect in the belief of a God and I don't mean any derogation to the faith of Christianity nor do I want to upset the users in this community.