This question is a bit loaded. We are allowing others to have their beliefs.

Not allowing theists to wield government institutions to compel, indoctrinate and recruit others into their religion, is not a banning of a belief. It is maintaining a secular society that is open and fair to all, as it was originally envisioned to be.

Ironically, atheists in the U.S., alongside other flavors of non-believers, are continually under attack or are slandered by theists. We're constantly having to correct misconceptions from people who were lied to from the pulpit.

Atheists are currently the most distrusted minority [1]. It is currently impossible for a known atheist to run any kind of high level office. Atheists "coming out of the closet" frequently lose friends, family and even their jobs, by those who were misled into thinking we are evil, untrustworthy and immoral.

Speaking up and standing up for ourselves is for self defense. Websites like this one are a manifestation of that.

We have a backlog of 2000 years of uninterrupted slander to process through.

The real question is "Why aren't more skeptics and non-believers standing up and talking more?", in a time of dogmatic overreach in society.