It does not matter what we do. There is nothing that God really needs from us. We can either give it freely and receive the blessings he has for us or withhold and get nothing. Famous quote from someone I love dearly "no one needs anything you have" and God does not need anything from us for he created it all!
It amazes me the compassion we have and regard we have for everything in this world and how we can think for a moment that God "needs" something from us. While he would love to have us near and dear to his heart there is nothing that we can do to out give God!