Science is a method to find truth by telling us how to construct proofs.
What we call rationality in general, in which science is based on, is to use proof to believe in something.
Whereas faith and so religion is believing without proof.
So as a scientist you do believe in any theory that has been proven. And of course you change your beliefs with each new information.
Believing isn’t just a word we use for religion, it also means to accept something is true.
I don’t think most scientists were religious, but for the one that were, people are never coherent, they can use science for some beliefs and religion for others even if that’s contradictory.
As for moral, i didn’t explicitly say it’s science, because it isn’t, it’s philosophy. But scientists that don’t want to believe in God and his morals have created other philosophies and morals.
Some based on the same premise of rationality as science. For which science can even be a tool.
Conversely the foundation of science always was motivated by philosophical questions about reality. And it’s application always had concerned about morals.
P.S. I don’t have faith, and i do think most current religions have bad morals and are just manipulative organizations. But most religious people are not part of them, most of them are good people. Their faith isn’t a problem for me or anyone, and can even be good driving force.