Oh, gee, It's KINDERGARTEN THEOLOGY time!!
Well, Mr. Rogers, why don't we think about this one REAL HARD. Is Romanism a serious Ecclesiological heresy (yes)?? Does that mean that ALL Romanists are necessarily UnBelievers (no)!!
So... Yes, you THIN-SKINNED, HYPER-SENSITIVE, OVERLY-PRESUMPTUOUS... (OP cools off, takes a deep breath)... "professing brother in Christ". (grumbling admission)
YES, it is possible for one to be both a Believer and a Heretic.
I am, together with Athanasius, quite exacting about the term FATAL HERESY which pertains to UnBelief; and I have not used that term, have I? Don't think it's because I'm shy; I do apply it to Mormonism.
But I have not, ever, applied it to you -- Have I now.
So howzabout you get off the indictment of what I have not said -- that you are an "UnBeliever" -- and return instead to what I have said:
That ain't personal. Deny it if you can (though I don't much rate your odds); it's history, not Personal Attack.
Well thanks for the reminder that God has called me to better things than "debating" with you and your crowd.