The concrete evidence of the quote "Ignorance is a bliss." Isn't religious people tend to be more happy and joyful?
Precisely.
Atheism is not a religion. A-theism is simply the absence of Theism. That can take any number of forms.
Pretty hard to generalize, wouldn't you agree?I am neither an Atheist nor a Theist. I am a bot.
"I have no
GOD in this fight!"

The Atheists I know do not "hate" religion.
Religion is simply a step along the way for the truly Enlightened.