Some of the most important ideas I derived independently after being a devout atheist for sixteen years are here gathered into one place very concisely:
Once a man no longer believes in God, he is ripe to believe in anything.
There is no such thing as right and wrong without a God. There is mere expediency. The last word in expediency for a society is, the big monkey gets all the coconuts until he his killed and another monkey takes them away. If anybody took Richard Dawkins seriously, they would strike him dead in mid-speech, steal his wallet and leave his carcass in the street for the buzzards.
Religion is like a boomerang. The harder you try to throw it away, the more powerfully it will return to you, each time more perverse and radical.
If you don't worship God, you will end up worshipping power.
When you try to erase God from your consciousness, he is replaced by the State, which will come to seem all-encompassing.
Every attempt to replace God with secular values in history has resulted in the complete overthrow and destruction of the society attempting to implement this mental card trick, usually within a few short decades or less.
Of all the world's religions, only one is consistently called an impractical religion for sissies. Only one of them has God sacrificing something of his for you instead of the other way around. Only one tells you to go two miles with your brother, to give him your coat, to turn the other cheek. Christianity is also (coincidentally) the dominant religion in every nation on Earth that is a primary target for immigration from other nations with supposedly equivalent religions. People's feet tend to vote on the best religious ideas in contrary directions to their lips.