Contentment is good, but it is not good to be content with one's spiritual practices. We are often satisfied with our spiritual progress, but our greed for worldly possessions is insatiable; this is where contentment is a vice. We should have very few physical needs and put most of our effort into spiritual matters.
Walking would be a constant falling forward. However, we walk because we have faith that we will not fall. The first step we took as a small child was entirely on faith. Man progressed from the time he was dwelling in the caves to the modern era of computers because of his faith in the observation of the world and in the laws governing it. This faith in his own sense organs and intelligence made him experiment with nature and discover her various secrets.
Yes, God is motionless, because there isn't any place where He is not. When a child is sitting in his mother's lap, he can cry for a million things, but he cannot cry for his mother to come. We are all in the lap of the infinite Truth. It is nearer than your own eyelashes. There is no distance between you and It.