I find your attitude to be similar to many church rebels who hang out here. Much of this thread contains their posts.
It seems to be the attitude of the guy who formed the cult I belonged to. He viewed himself as being the only one who was able to discern what Scripture said, and put no weight on church history. It is a very prideful attitude, and leads into spiritual darkness ultimately. I realize I'm not the first Christian to come on the scene, and that I stand on the shoulders of other great men of God.
By the way, the prevailing view of theologians is in line with Scripture. One can easily refer to the Scriptures they cite to verify it.
It is obvious there is one God in one sense, and there are three Persons. Christianity has described the oneness as one of being or essence, and the threeness in terms of person. This is perfectly coherent, and there is no conflict.
This statement you made is perfectly correct and consistent with Trinitarianism, only you can't take away one of the Persons because they are coessential: The word 'His' refers to God but God is comprised of the Father, Son, and Holy Spirit. Take away one or more of these entities and there would be no God.
Maybe you have a vocabulary issue, but it's hard to tell.