The trinity is near-heretical. Yahweh our God is ONE God, and not three. The trinity idea, it can be shown, dates back to ancient Egypt. I discussed that - citing and quoting from a 19th-dynasty prayer inscription - at the beginning of the program I did on this topic with Pastor Visser. There were other versions of the trinity in ancient Mesopotamia.
That Yahshua Christ is Yahweh having come as one of His own is part of the Christian revelation, and the Truth that jews, muslims and other heretics reject. Those who think that Yahshua was anything other than Yahweh in the flesh are following the jews.
The Son and the Holy Spirit are both manifestations of the ONE God, Yahweh. Other manifestations were at various times the "rock" in the desert, the "pillar of smoke (or fire)" etc. A better way to interpret the "I am what I am" statement at the burning bush account in Exodus is perhaps "I am whatever I wish to be".
Jeremiah 23:5 Behold, the days come, saith the
LORD [Hebrew: Yahweh], that I will raise unto David a righteous Branch, and a King shall reign and prosper, and shall execute judgment and justice in the earth.
Jeremiah 23:6 6 In his days Judah shall be saved, and Israel shall dwell safely:
and this is his name whereby he shall be called, THE LORD [Hebrew: Yahweh] OUR RIGHTEOUSNESS.
http://christogenos.org/Radio%20YCP/YCP20091128.mp3