Praise the Lord, hmh.
I agree that we can get a little too zealous over certain things.
For the record, I do not think that the Trinity is a "man-made doctrine." I think that the Bible clearly teaches that the Father is God, the Son is God, and the Holy Ghost is God. Yet, the Bible maintains that there is only 1 God. Hence, the 3 manifestations must be the 1 God.
It isn't the easiest thing to understand, but that shouldn't be an issue. Remember;
Isa 55:8 For my thoughts are not your thoughts, neither are your ways my ways, saith the LORD.
Isa 55:9 For as the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts.
If we could understand everything about God, then God would not be God.
But, I do respect the views of those who do not believe in the Trinity. I've been through lengthy discussions with a friend of mine (mentioned earlier) who can articulate his views quite clearly, but it is my opinion that is is just as clearly wrong. But, we can agree to disagree agreeably
I would love to chat with you via PM or something on the topic.