Is there any way or sense in which God is necessary? For instance, is God necessary to explain anything about the universe? Is God necessary to make life meaningful? Is God necessary to underpin morality? Or, is God necessary for some other reason?
If God is in any way or sense necessary, in what way or sense is He necessary? And why is He necessary?
I do not think that God is necessary in any way, whether it be morally, scientifically, or for worth in life.
If it is necessary for God to exist so that people do good deeds, I would despair at the motives behind this - it should be enough to do it on the basis of helping your fellow man, not to save yourself from damnation or to curry favour with a god.
Nor do we need God to exist to give a deeper meaning to life. People's goals in life should only be based on their personal ideas and feelings, and what they wish to do. Whether that goal is be eradicating world hunger, curing cancer, spending a life in solemn worship, or being the best at latest computer games, good for them. My personal opinion on each should not matter, nor should anyone else's, nor should a big beard in the sky make individual judgements on who's goal is more worthy.
As for an explanation about the universe or any component that makes up the universe, I am quite happy to leave that in the realm of science. Science gives testable hypotheses about the universe. It gives concrete measurements and equations. Religion or God cannot do this for us. As it stands now, God is either an appendage to any scientific explanation, or a refutation of it without scientific merit. Adding God to any explanation adds nothing to our understanding of the world, and only serves to increase the complexity behind the explanation.