I'm not sure that my set of symptoms would exactly fit into the description of Religious Trauma Syndrome, if only for reasons of technicality: the organization I got sucked into for a time was certainly cult-like and ideology-rich, but not religious per se.

What I did end up with as a result is what is now called "Other Specified Dissociative Disorder" (OSDD) in the DSM-5 (represents a mild upgrade of specificity, since I previously fell under "not otherwise specified"), in which one of the features I suffer from is "Identity disturbance due to prolonged and intense coercive persuasion: Individuals who have been subjected to intense coercive persuasion (e.g., brainwashing, thought reform, indoctrination while captive, torture, long-term political imprisonment, recruitment by sects/cults or by terror organizations) may present with prolonged changes in, or conscious questions of, their identity."

One of the most basic and most troubling problems of deep group involvement can be the effect of "identity fusion", a construct proposed by William Swann. I've found this diagram from one of his books helpful in considering my own level of identity fusion as it pertains to former group involvement.

"Pictorial measure of fusion: Please circle the letter below the picture that best represents your relationship with this group."

From: Swann, W.B. Jr., Gómez, A., Seyle, C.D., Morales, J.F. & Huici, C. (2009). Identity fusion: The interplay of personal and social identities in extreme group behavior. Journal of Personality and Social Psychology, 96, 995–1011.

I've found it to be a lot of work to unravel what was so underhandedly bestowed upon my unconscious workings. It's hard for people who haven't witnessed it firsthand to understand just how pervasive it is, and those who don't get it seem to really recoil from the concepts involved. I've found it really important to separate the wheat from the chaff where finding a soft place to land with discussing this particular area of interpersonal reality is concerned. I have a very few friends whom I can talk to about it at all without them becoming alienated as a matter of course. The one with a PhD in sociology turns out to be the most capable, and receptive.

Here's a link to a site that outlines an array of complications and problems common to many situations of group dynamics: Theories about groups

Very best of luck to the OP and to anyone else struggling with the effects of such situations.