Is it really that hard to believe that the Holy One could manifest Himself in three ways, or in any way He chose? He was the Creator, everything came from Him, One and whole from the beginning. He can mainfest Himself in any number of ways. We can see Him and learn from His creation or from others. If He chose to reveal HImself to us in three main ways, the Father, Son and Holy Spirit, to meet us as Holy in the way we are wholy designed, why should that be hard to understand?He is One and He meets us three ways.