Father vs The Holy Spirit

[Rico]

This is a question that has been brewing in my mind for quite some time. What is the difference in the manifestation of the Father vs that of the Holy Spirit? It is my understanding that we get three from the following scripture:

1jo 5:7 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.

However, it is my understanding that this scripture is not found in the original manuscripts because it was added at some point in history. I could not find anywhere else that mentions three as being Father, Son, and Holy Ghost. I can see how "the Son" would be considered a manifestation, God in the flesh. But it seems to me that the Holy Spirit and the Father aren't described in the Word as different manifestations. The Bible doesn't say the Father overshadowed Mary to conceive Jesus. It says the Holy Spirit did, but Jesus refers to Him as the Father. It seem to me that there are only two actual manifestations of God in the Bible, not three. Can someone shed some light on this for me?