Science is about finding ever better approximations rather than pretending you have already found ultimate truth.
A casual stroll through the lunatic asylum shows that faith does not prove anything.
The religion that is afraid of science dishonors God and commits suicide. Every influx of atheism, of skepticism, is thus made useful as a mercury pill assaulting and removing a diseased religion, and making way for truth.
In many cultures it is customary to answer that God created the universe out of nothing. But this is mere temporizing. If we wish courageously to pursue the question, we must, of course ask next where God comes from? And if we decide this to be unanswerable, why not save a step and conclude that the universe has always existed?