I looked up this Church on the web and read their manifesto. Dr. Christmas seems to be a very strong individual and prolly personally guides the flock.
It is a non-denominational church but the doctrine is very Baptist IMO
There is one thing that stands out and that is the "philosophy of Ministry". A very detailed set of instructions on how one is to do the work of the Lord, behave and believe.
A lot of effort went into developing this and therefore members are strictly held accountable.
I think the outing of this person is a object lesson for the congregation to show the church won't tolerate this sort of behavior and that consequences will result.
This church seems to be autonomous and not part of a Convention but I could be uninformed.
Of course, the freedom to associate or NOT associate with others is their right.