Alpha, God has already judged those who reject His truth in favor of the traditions of men. Therefore, when Jesus says that eternal life requires that we believe the Father and Trinitarians believe Origen and the other ECF's who decided that Jesus is God they judge themselves. When people believe Satan's lies then they are part of Satan's kingdom not the Kingdom of God.
Now, if you can refute the Scriptures I have posted that show the Trinity is a false doctrine then do so instead of trying to attack me, which is the last resort of any person who cannot defend what they want to believe.
You alluded to Paul's use of the word "mystery", so let's see where Paul speaks of "mystery".
Ephesians 1:3-14
3 Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ, 4 just as He chose us in Him before the foundation of the world, that we should be holy and blameless before Him. In love 5 He predestined us to adoption as sons through Jesus Christ to Himself, according to the kind intention of His will, 6 to the praise of the glory of His grace, which He freely bestowed on us in the Beloved. 7 In Him we have redemption through His blood, the forgiveness of our trespasses, according to the riches of His grace, 8 which He lavished upon us. In all wisdom and insight 9 He made known to us the mystery of His will, according to His kind intention which He purposed in Him 10 with a view to an administration suitable to the fulness of the times, that is, the summing up of all things in Christ, things in the heavens and things upon the earth. In Him 11 also we have obtained an inheritance, having been predestined according to His purpose who works all things after the counsel of His will, 12 to the end that we who were the first to hope in Christ should be to the praise of His glory. 13 In Him, you also, after listening to the message of truth, the gospel of your salvation-- having also believed, you were sealed in Him with the Holy Spirit of promise, 14 who is given as a pledge of our inheritance, with a view to the redemption of God's own possession, to the praise of His glory.
NAS
Paul starts this teaching with blessing the God and Father of the Lord Jesus Christ, which is a bit odd if Paul believed that Jesus is god. He then goes on to teach that God has revealed His mystery, not that salvation by His grace through faith is a mystery that we cannot understand. In Ephesians 5 & 6 Paul again teaches that the mystery is the Lord Jesus Christ.
Peter, Paul, and John are clear that Jesus is a man who God the Father highly exalted to His right hand as Prince, Savior, King of Kings, Lord of Lords, the only way to the Father, and etc. However they never teach that Jesus is God because they believed God who plainly states in the foundation of Christianity that He is the only God who alone created all that exists.