There is more to this than "falling into error". This is a misidentification of the Lord Jesus and the Holy Spirit which is more than just a rough patch of doctrine here and there. I'm sure we can disagree on many many points of doctrine and still have fellowship, but when you are worshiping another "god" we're talking apples and oranges. I don't differentiate this from Jehovah's Witnesses or LDS, not our God, just some similar trappings.

Would you say that a SINCERE LDS follower was a believer "in error"?

I see your point and I'm working out my salvation through ongoing sanctification where I keep encountering more and more error in my own life. We (as believers) are all in error and need to recieve correction in humility.

I'll try an curb the sarcasm in my commentary and apologize for the tone of my writing that caused offense. I'm also sorry for my defensive posture in the posts that followed.