i think i found a winner though:
Religion is excellent stuff for keeping common people quiet.
--Napoleon, early 1800s

these seem to be a running theme:
The world holds two classes of men -- intelligent men without religion, and religious men without intelligence.
--Abu'l-Ala-Al-Ma'arri, Arabic poet, early 1000s

Religion is something left over from the infancy of our intelligence; it will fade away as we adopt reason and science as our guidelines.
--Bertrand Russell, early 1900s

and what about them presidents... in god we trust?
Religions are all alike -- founded upon fables and mythologies.
--Thomas Jefferson, early 1800s

The question before the human race is, whether the god of nature shall govern the world by his own laws, or whether priests and kings shall rule it by fictitious miracles.
--John Adams, early 1800s

This would be the best of all possible worlds if there were no religion in it.
--John Adams, early 1800s

The Bible is not my book and Christianity is not my religion. I could never give assent to the long complicated statements of Christian dogma.
--Abraham Lincoln, mid 1800s

and for the ladies:
To no form of religion is woman indebted for one impulse of freedom.
--Susan B. Anthony, suffragist, mid 1800s

i love this shit:
The priests used to say that faith can move mountains, and nobody believed them. Today the scientists say that they can level mountains, and nobody doubts them.
--Joseph Campbell, mythologist, late 1900s

and we already knew this guy was a pimp:
So, when Adam and Eve were in the Garden of Eden, if you go for all these fairy tales, that "evil" woman convinced the man to eat the apple, but the apple came from the Tree of Knowledge. And the punishment that was then handed down, the woman gets to bleed and the guy's got to go to work, is the result of a man desiring, because his woman suggested that it would be a good idea, that he get all the knowledge that was supposedly the property and domain of God. So, that right away sets up Christianity as an anti-intellectual religion. You never want to be that smart. If you're a woman, it's going to be running down your leg, and if you're a guy, you're going to be in the salt mines for the rest of your life. So, just be a dumb fuck and you'll all go to heaven. That's the subtext of Christianity.
--Frank Zappa, late 1900s

and you gotta throw this dude:
No actual tyrant known to history has ever been guilty of one-hundredth of the crimes, massacres, and other atrocities attributed to the deity in the bible.
--Steve Allen, late 1900s

and just to end it as the link did:
Imagine the people who believe such things and who are not ashamed to ignore, totally, all the patient findings of thinking minds through all the centuries since the Bible was written. And it is these ignorant people, the most uneducated, the most unimaginative, the most unthinking among us, who would make themselves the guides and leaders of us all; who would force their feeble and childish beliefs on us; who would invade our schools and libraries and homes. I personally resent it bitterly.
--Isaac Asimov, late 1900s

my bad.
i told you there were too many to post.
but i attempted anyway...
i mostly just threw in the ones where people would know the quoter, mostly.