Anti-theists have never banned the practice of religion, but they do insist that man-made law takes precedence over religion. For example:
-Muslims can have their own Churches in Democratic countries, but they cant practice barbaric laws like stoning women to death.
-Christians are not allowed to sacrifice people as heretics on the basis of religious beliefs. For example, a woman who is smart must be a witch, and then burning her to death).
Your rights are limited by the rights of others. This is something that religious people can't understand because they think that God is on their side,
No one can be 100% sure that God exists unless they have been totally brainwashed and do not think. Having blind faith like Abraham is just being a stupid.