For the sake of discussion, let me propose some highly oversimplified definitions:
science – Knowledge you test for yourself.
religion – Knowledge you get from someone else and take on faith.
What does this imply? The practical everyday business of science requires us to take things on faith. We can’t possibly reproduce every experiment ourselves, even in our own field, so we trust in the ability and honesty of fellow scientists. That faith is religion. For the average guy not practicing science, the whole thing is religion, handed down by priests wearing white lab coats.
What about someone who experiences God directly? For that person it’s science. But we can’t possibly test someone else’s experience. If he or she writes it in a book and we read about it, for us it’s religion.