Whose straight thinking is the straightest?

Disagreement among brothers and sisters as fellow followers of God is not in and of itself the issue; there always has been, and for the foreseeable future will continue to be disagreement. The problems arise from a failure to handle those disagreements in God honoring ways. Those who exclude other followers of God because of theological differences they may possess, feel they have justifiable and even at times Biblical reasons to do so. It is an interesting

phenomenon that in the minds of so many believers, salvation or ones eternal destiny is swayed dramatically (and many times rapidly) by a belief to which someone may or may not adhere. Is our eternal destination or participation in the Kingdom of God completely bound up in the theological or doctrinal strands to which we may or may not hold (have held)? Who’s Orthodoxy is actually correct, and does this refer to Apostolic understanding or should the later Roman Ecumenical Church Council rulings be upheld? If so, which one(s)? Should we instead set our sights on later history when the Reformers took us back to what they considered the pure faith? If so, which Reformer accomplished this as a perfect vice-regent of God's divine purpose? If our eternal destiny indeed hangs in the balance upon the scales of Christian belief, then we would do well to spend our time in pursuit of the one and only guardian of “straight thinking” that God condones and follow those who teach it (satire). There have been many of our ancestors (i.e. Anabaptists, Jews) who have been persecuted because they failed to conform to the religious dictum of the times. Is this how the Messiah taught to bring the Good News of the Kingdom? 

They that approve a private opinion, call it opinion; but they that dislike it, heresy; and yet heresy signifies no more than private opinion."Thomas Hobbes

(Note: To make sure I am not misunderstood in my context; I am not speaking of other religions such as Islam which have an entire different system of epistemology, nor am I inferring an embrace of  Ecumenicism. I am directly speaking of the many factions and splinters of diversity on the Judeo-Christian frontier. Treatment for other humans in a Messiah-like manner is a perquisite for his followers regardless of their religious or theological orientation).