I think the important distinction to make is between a lie and a conviction. A lie is where someone knows the facts but intentionally misrepresents them. A conviction is where someone actually believes something. I believe the vast majority of people have propogated religion out of conviction rather than outright lying. This is a sadder point to make. The con-man knows he is a con-man and don't get me wrong religion has had some exceptional con men but overwhelmingly people have spread it because they actually believe it which is just disheartening to think of.
"A casual stroll through the lunatic asylum shows that faith does not prove anything." -Friedrich Nietzsche
"All thinking men are atheists." -Ernest Hemmingway
"Those who can make you believe absurdities can make you commit atrocities." -Voltaire
"All thinking men are atheists." -Ernest Hemmingway
"Those who can make you believe absurdities can make you commit atrocities." -Voltaire