The Trinity is such a widely accepted doctrine that it is strange to see it challenged. This doctrine teaches that God, Jesus, and the Holy Spirit are all the same entity, until they aren’t. Here is a video for you to consider about who Jesus really is. Below the video is more text about this very important topic.
The volume of scriptures indicating that Jesus and God are separate beings is overwhelming. The biggest and most fundamental problem with the doctrine of the Trinity is that its ultimate conclusion is that Jesus did not actually die and was not actually resurrected by the Father. If one is to believe that Jesus was immortal at the time of His crucifixion, then He sacrificed nothing and his death and resurrection were merely an act or a facade. If you believe that Jesus voluntarily left the Father, voluntarily became man, and voluntarily gave His life – 100% of it, died for our sins, stayed dead for around 72 hours, and was resurrected by the Father, then you don’t believe in the Trinity.
Consider the following verse:
Who is he condemning? It is Christ who has died, but rather also who is raised, who is also at the right hand of God, who also intercedes for us. (Romans 8:34)
Christ is at the right hand of God and intercedes for us. One cannot sit at the right hand of oneself. Christ intercedes which means He is between us and the Father, advocating for us. One cannot be between us and the Father and be the Father at the same time.
For God is one, and there is one Mediator between God and man, the Man Christ Jesus, (1 Timothy 2:5)
Jesus is the Mediator between God and man.
And He went a little further and fell on His face, and prayed, saying, O My Father, if it is possible, let this cup pass from Me. Yet not as I will, but as You will . (Matthew 26:39)
Jesus prays to the Father. He does not pray to Himself and apparently the Father’s will is different from the Son’s will. They aren’t the same. The Spirit isn’t even mentioned.
Here is a sermon with pdf of the notes with further explanation on how the Trinity is impossible. Why Not Trinity? A message about how Yeshua is not YHVH here http://www.hebrewrootsgroup.com/sermons/yeshua-is-not-yhvh/ and one here about restoring Yeshua as our Mediator and High Priest http://www.hebrewrootsgroup.com/sermons/restoring-yeshua-as-mediator/