I think it's less about making sure no one is ever offended ever and instead about making sure that rules are in place that ensure that a certain standard is set. So yes, a conservative Christian might be offended when discussing homosexual marriage for example, but if the wider community has stipulated that TWHL is a safe and inclusive place for all people regardless of their sexual orientation, then that is the standard that is followed.
Freedom of speech is frequently misinterpreted. It's a mandate that prevents a government from actively censoring its own citizens. It, however, does not mean that speech is consequence-free, particularly if whatever is said breaks other laws. Furthermore, TWHL is a privately-run community and is free to set its own regulations as to the types of speech it will and won't accept, with the condition that if you want to be a part of this community, you abide by those rules.
Personally, I want TWHL to be as inclusive as I remember it when I joined over 15 years ago. Inclusivity is not about allowing absolutely everything and anything onto the site, it's about ensuring that people are treated with respect and dignity. If your opinions and beliefs go against the concept of inclusivity, then maybe TWHL is not a place you want to be in.
Edit: I should also add that I am not anti-religious or anti-conservative. I am, however, fully against hiding behind those titles to attack others who do not come under those purviews.