One God

I went to church tonight and something that was said concerned me.  The belief that God is three persons.  That the Father Son and Holy Spirit is three different persons is a lie from the devil.  God is not a person.    As John 16:17 states with Jesus replying to Peter for this was not revealed to you by flesh and blood, but by my Father in heaven.  Jesus just told us that his Father is not made of flesh and blood.  Jesus is the visible form of the invisible God.   What concerns me is that the pastor said that the trinity is a vital truth.  With what has been revealed to me through study and teachings I have heard I can not and will not believe in the trinity.  What makes things difficult is by not knowing who God truly is you may wonder who do you pray to.  Do I pray to the Holy Spirit should I spend time praying to each.  Jesus said to pray in this manner Our Father who art in Heaven.  There is only one that we pray to.  In Isaiah 45:24 it says "I am the Lord who has made all things, who alone stretched out the heavens, who spread the earth by myself."  God will share His glory with no man.  A person is by definition an individual human being and you can not tell me there are three person in one God it just can not be.  I know that God is God alone and not three persons on a throne.  I know that many will not agree with me but I hope that you will not just blindly dismiss what I write but rather seek for yourself who God is.