Think of black holes. You cannot perceive them, so why should you recognize that they exist? Well, scientists say they do. Scientists say they are important, and scientists have data which provides some level of verification.
Why should you recognize that God exists? Well, religious people say He does. Religious people say He is important, and religious people have data (testimonials) that provide some level of verification.
Some people think scientists have credibility -- in other words, they have faith in scientists. Some people think religious people have credibility -- in other words, they have faith. Some people have faith in both science and God.
Says who?
I've always considered that position agnostic, rather than atheist. Isn't atheism a positive belief that God does not exist?
I've always considered that position (God positively doesn't exist) to be silly, as you can't prove a negative.