the trinity is very much a bibical doctrine, just because we can't fully comprehend it, does not make it non existence, God gave it to me like a Pie. He new I understood food. take a pie cut it into three equal parts. unless someone comes a long like me and takes a piece of the pie we still have a whole pie. three parts/pieces, but one whole pie. same As God three equal parts but one God. Jesus was equal with God, the scripture we find where He is not equal was while He was in the flesh, no big deal for the same scriptures that says that Jesus felt it NOT robbery to be equal with the Father, tells us that when He took on the flesh that He was made a little lower than the angels.
there are all equal, someone stated that Jesus was even under the Spirit, while scriptures teach us that, the Spirit reminds us of What Jesus did, if the Spirit was greater, wouldn't Jesus teach us what the Spirit did. they are all the same there are several places in the scriptures that does put them in the same scenes together but yet separate The Baptism of Jesus, for example, the Son was Baptised, the Father spoke from heaven "this is my Son" and the Spirit descended like a dove from the Father down to the Son.. here are three verses we can learn from Joh 1:1In the beginning was the Word, and the Word was with God, and the Word was God.Joh 1:2The same was in the beginning with God.Joh 1:3All things were made by him; and without him was not any thing made that was made.
Joh 1:14And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.