Does the LDS organization have secret sacred temple ceremonies?
BTW, when you use a capital "O" when referring to "orthodox Christianity" in general, you appear to be making reference to the Orthodox Church, a Constantinople-based, world-wide denomination which includes Greek, Russian, Serbian, and other groups (called "rites" by them).
I was raised in the Greek Orthodox Church and, with or without me, they remain a conservative and Christ-focused denomination. My widowed mother still is an active member of the Greek Orthodox Church and we respect each others' views and religious activities.
As a general observation, I must say that Christians of all types, Jews, moderate "non-hijacked" Muslims (who now are numbered amongst the targets of Islamofascists), Hindus, etc. must stand firmly together to face a fanatical force which, as it has declared, seeks to "convert" by force -- unto death -- the entire world.
"Range wars" carried out on the FR and elsewhere between Roman Catholics, evangelical Christians, bona fide Muslims, religious Jews, etc., etc., are counter-productive and waste time, effort, and resources that would be better spent resisting that which increasingly resembles the scriptural description of the Anti-Christ which defines victory as the destruction of the free agency of God's children. It is my sincere belief that we indeed are in the latter-days, and accordingly we must work together and, insofar as possible, in love and harmony to prepare the earth for the coming of the Messiah and His eternal triumph over Satan. Truth, resolve, courage, devotion our Father in Heaven, abound and transcend issues of denomination and affiliation -- and they exist wherever they can be found....