Science is about what we know and don't know. Unfortunately, there's more we don't know. As we learn more, we ask more questions, so the amount we don't know grows as quickly as the amount we know. Science is honest about what we know and don't know. It's really about both. Science is about the search for answers. it's about what's verifiable, what we can prove.
Religion is about what we BELIEVE. Religious people sometimes make the mistake of confusing belief with knowledge, but nobody really can say they KNOW this stuff. Religion often feels it has to have an answer for everything, so ti's not honest about what we don't know. It's not about verifiable observations or the results of experiment.
Now the way human nature works, some of us have to have answers while some are more in love with the questions, the mysteries. If you ask a scientist some huge question like 'How did we get here?' or 'What is our purpose in the universe?' he doesn't have a ready answer for that but he can show you the evidence, the stuff we do know. If you ask a religious leader those questions he has a complete answer ready for you, but it's necessarily simple, and it depends on your belief, it's not readily demonstrable.
Both of these approaches appeal to different people. People who want to have an answer to cling to that they're not too skeptical about, and people who accept that nature is very complicated and the more we know the more we know we don't know.