Astrophysicist Carl Sagan said, “An atheist has to know a lot more than I know. An atheist is someone who knows there is no god. By some definitions atheism is very stupid.”
Neil deGrasse Tyson, Big Think interview, "Consider also that in America 40% of American scientists are religious, so this notion that if you're a scientist that you're an atheist, or if you're religious that you're not a scientist, that's just empirically false. It's an empirically false statement."
http://bigthink.com/videos/neil-degrasse-tyson-on-science-and-faith
Gregor Mendel (1822-1884), considered the father of genetics, was an Augustianinan friar and abbot of St. Thomas' Abbey in the Austrian Empire. Mendel discovered the basic principles of heredity through experiments in his monastery's garden. His experiments showed that the inheritance of certain traits in pea plants follows particular patterns, subsequently becoming the foundation of modern genetics and leading to the study of heredity.
Werner Heisenberg (1901-1976) was a German theoretical physicist and one of the key pioneers of quantum mechanics. He was awarded the Nobel Prize in 1932. He was a Lutheran and a member of Germany's largest Protestant religious body, the Evangelische Kirche. He said, “The first gulp from the glass of natural sciences will turn you into an atheist, but at the bottom of the glass God is waiting for you.”
The Big Bang Theory was first proposed by a Catholic. In 1927, the Belgian Catholic priest Georges Lemaître proposed an expanding model for the universe to explain the observed redshifts of spiral nebulae, and calculated the Hubble law. He based his theory on the work of Einstein and De Sitter, and independently derived Friedmann's equations for an expanding universe.