Every group has douche-bags.
Hinduism, Buddhism, Christianty, Atheism, whatever it is there are people who are going to argue over it, this doesn't make the religion or lack of one bad.
Like you said, everyone is entitled to believe what they want to believe and for plenty of people their religion can provide stability and something that lets them to connect with their family. On the other side Atheism has more freedom to it where you don't have to worry about an all seeing power watching your every move or being worried of coming back to life as a slug.
The world would be a much better place if people kept an open mind.