All the religions of the world today affirm the all-knowing omniscience of God. There is nothing hidden from him. There is nothing that he does not know. In the light of the truth, which every devout believer accepts, the place of prayer becomes clear to you in this manner. Omniscience means that god knows everything. However, it does not mean that he is doing something in connection with what he knows. Also he has millions and billions of human beings to attend to in his creation. He also do have millions and billions of other creatures great and small, whom he has to look after and provide for in every want and requirement. The human individual therefore feels it very necessary to attract God’s attention and draw it towards himself or herself. Thus despite God’s omniscience the human beings prays to attract his special attention towards oneself.
There are many ways to pray: prostration, prayer, wheels, pilgrimages, kneeling in church, circumambulating all using the body. Also chanting, verbal prayers and silent or interior prayers. Different people pray in a different way. Like Austere monastic prefer the silent, interior prayers. Whether some work better than others is a matter of how you look at it. Take the example of the prayer wheel. The Tibetans live in icy cold place. Sometimes at 18000 feet above sea level. They have to engage in some sort of physical activity to stimulate the blood circulation. Hence, the rotating of the prayer wheel. Lord Jesus once said that pray ceaselessly. The Tibetans also do this by fixing somewhat bigger sized prayer wheel atop a structure or a post specially set up for this so that it catches the blowing wind and keeps on rotating day and night.