Sounds like you need an attorney, not CFI. If you have a solid case, an attorney might take your case for no money up front and instead take a cut of any settlement received.
I’ve heard of cases of “anti-religious” people having their social networking site or internet service disrupted, however, it was allegedly because they were harrassing the religious or violating other policies - not because they simply expressed different points of view. There are all kinds of small things in the “terms of service” policies in social sites and internet services that we rarely read through fully before checking the “I Agree” button to continue. (But I wouldn’t put it past someone who hates atheists to nitpick and find something small with which to terminate the service.) Joining a service - website or service provider - does not guarantee freedom of speech. These are companies you sign up with, and the user must agree to abide by the company’s rules. (At least this is my understanding of how it works. I may be misinformed.)
Regarding being fired for being an atheist, it’s hard to prove unless you have really solid evidence such as emails, memos, voicemails, or witnesses. Also, if the employer was a non-profit group of any kind (charities, churches, religiously affiliated social services, etc.) they CAN legally fire you for not being the same religion. Otherwise it’s none of their business what church you do or do not attend.
As far as being “cyber stalked” by religious nuts, I don’t know what to do about that other than get a new facebook website and email address, etc. Well, maybe if the same people can “get you banned” can’t you “get them banned” for harrassing you? Harrassment would probably violate their terms of service agreement with the host company.
Just thinking out loud, I guess. Hope you find a token or two of helpful ideas or starting points in that mess.