What would you say?

Would you say that god is omnipotent? Would you say that god knows everything from start to finish? Beginning to end? Would you say that god knows everything before it happens? Is everything predetermined by god? Is there nothing that man can do to change gods plans? THEN WHY DO WE PRAY? If everything is predetermined and things are going to be carried out according to gods plans, then what good is prayer? Can pray change anything? And if prayer can change things, then it can only change that which god has already preplanned to be placed into action, therefore, prayer makes no sense regardless.