Is God omniscient and omnipotent?

If so don`t you find these attributes contradictory? If God is omniscient and he knows everything - then he knows everything that he is going to do. He knows everything that he did. There is no "State of Uncertainity." If knows everything that he is going to do then how can he have "Free will" to choose? A God that knows everything cannot be omnipotent because he already knows what he is going to do. That God would be deterministic a slave to his own nature. If he knows everything and he is eternal then he would take him an eternity to remember everything that he knows. It`s a nonsensical propostion - it`s meaningless. Imagine something that is all powerful. Power is a capacity of force. Some are greater than others. Saying that God is all powerful implies that he has no compacity of force hence, he`s powerless. Omnisicence, omnipotence, omnibenelovence are attributes that sound "cute" but mean absolutely nothing.