Actually Dave, there are folks who completely discard everything considered Christian -- right from the Trinity and the Divinity of Christ downwards... They AREN'T Christian..
Why is it the Bible calls it Godhead and those after the Lord and his Apostles are no longer on earth decide to call Trinity?
Now Trinity means 3 which is true there are 3 members in the Godhead, but it seems when Trinity is defind it changes the concept that was given in the scriptures even in some passages Jesus makes a distinction between Him and His Father in heaven!
John 20
17 Jesus saith unto her, Touch me not; for I am not yet ascended to my Father:
but go to my brethren,
and say unto them,
I ascend unto my Father,
and your Father;
and to my God,
and your God.
So here Jesus CLEARLY SAYS THAT HE ASCENDS UNTO
His Father and Our Father!
To His God and Our God!
Jesus does say he must return to his present self or anything like it he declears there is a Heavenly Father, another being beside him!
Myself I could call those who choose to embrace the Trintiy definition are not Christains but that would be rude, nor do I feel threathen by those who understand it differently!
Some get upset with Catholic because their understanding of certain scriputers as in the Magisterium does not make you unChristian!
Just becasue all agree on the Tinity version does not make you Christian!
It is the belief in Jesus Christ that makes you Christians!
In the mean time while all these other issues are debate on terminology "free will/predestant" "seperate being/all in one substance" "bio sibling/spirital brethrens" etc.
those who are followers of Jesus Christ, believes Jesus Christ is the Savior and "Keeps His Commandments!"