Following a discussion in a thread, in which the suggestion, or demand, came up to ban religion from the general arranger forum entirely, I think it is a good idea to first present some quotes about the basic concepts of 'Freedom of Religion' and 'Freedom of Speech':

Quotes from Wikipedia about Freedom of Religion and Freedom of Speech/Expression:

"Freedom of religion or freedom of belief is a principle that supports the freedom of an individual or community, in public or private, to manifest religion or belief in teaching, practice, worship, and observance. It also includes the freedom to change one's religion or belief.[1]"
Freedom of religion is considered by many people and nations to be a fundamental human right"

"Freedom of speech is the right to communicate one's opinions and ideas without fear of government retaliation or censorship. The term freedom of expression is sometimes used synonymously, but includes any act of seeking, receiving and imparting information or ideas, regardless of the medium used.

Governments restrict speech with varying limitations. Common limitations on speech relate to libel, slander, obscenity, pornography, sedition, incitement, fighting words, classified information, copyright violation, trade secrets, non-disclosure agreements, right to privacy, right to be forgotten, public security, public order, public nuisance, campaign finance reform and oppression. Whether these limitations can be justified under the harm principle depends upon whether influencing a third party's opinions or actions adversely to the second party constitutes such harm or not. Governmental and other compulsory organizations often have policies restricting the freedom of speech for political reasons, for example, speech codes at state schools."

In my opinion it is a totally unacceptable demand to ban an internet forum of any reference to personal religious beliefs. Atheists should respect that for some people religion plays a certain role in their lives, and even if a musicians' forum should definitely not be used to put religious thoughts instead of music in the main focus, it is inevitable that sometimes there are references to what individuals feel is important for their personal life, and in some cases this can be religion.
In the particular case to which I'm referring here, banning religious content would mean that quoting a newspaper article with a reference to religion would be against forum rules, or one would have to censor and eliminate certain sentences from that newspaper article. - Come on, where are we getting there? This reminds me of totalitarian regimes, not of a modern society.
Of course the owner of an internet forum could set any board rules he/she wants, but if a forum didn't reflect the liberty of expression practised in modern, open societies and ban any reference to religion, I would quit it and morally disqualify it.

OK, so much for my stance in this matter.