A whole list of them.  While some of the quotes are (in my view) a little hostile toward religion, there are some that particularly resonate with me (especially the first one):

"I contend that we are both atheists. I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours" – Stephen Roberts

"You can’t convince a believer of anything; for their belief is not based on evidence, it’s based on a deep-seated need to believe." – Carl Sagan

"And if there were a God, I think it very unlikely that He would have such an uneasy vanity as to be offended by those who doubt His existence" – Bertrand Russell

"Is God willing to prevent evil, but not able? Then he is not omnipotent. Is he able, but not willing? Then he is malevolent. Is he both able and willing? Then whence cometh evil? Is he neither able nor willing? Then why call him God?" – Epicurus

"Blind faith is an ironic gift to return to the Creator of human intelligence." – Unknown

"There once was a time when all people believed in God and the church ruled. This time was called the Dark Ages." – Richard Lederer

"I do not think it is necessary to believe that the same God who has given us our senses, reason, and intelligence wished us to abandon their use, giving us by some other means the information that we could gain through them" – Galileo

"We must question the story logic of having an all-knowing all-powerful God, who creates faulty Humans, and then blames them for his own mistakes." – Gene Roddenberry

"Gods are fragile things; they may be killed by a whiff of science or a dose of common sense." – Chapman Cohen

"Science is like a blabbermouth who ruins a movie by telling you how it ends! Well I say there are some things we don’t want to know! Important things!" – Ned Flanders

"I have examined all the known superstitions of the world, and I do not find in our particular superstition of Christianity one redeeming feature. They are all alike founded on fables and mythology." – Thomas Jefferson

"If triangles had a god, He would have three sides" – Unknown

"But I don’t have to know an answer. I don’t feel frightened by not knowing things, by being lost in the mysterious universe without having any purpose — which is the way it really is, as far as I can tell, possibly. It doesn’t frighten me." – RIchard Feynman