It's not only that it lacks support. For me it's the almost endless crazy contradictions that Trinity presents. Yet trinies don't care. A new Barna survey shows only 16% of Christian say they believe in Trinity.Amen. And another thing, they had already been seeing Jesus for a while already until Jesus suddenly said "If you really know me, you will know my Father as well. From now on, you do know him and have seen him.” If looking at Jesus with their eyes was the same thing as seeing God, why didn't they see God until much later? Your point is intuitive and clear. It's definitely a "knowing and understanding" sense in John 14:7.