Your argument is based on a total lack of Biblical truth, which is why I now reject the Trinity as a false doctrine developed by Greeks who were influenced by the pagan backgrounds, Greek philosophy (including Gnosticism, where do you think the ascension of Mary came from), and lack of knowledge concerning the foundation of Christianity.
Tell me Believer, have you read in John 17:3 where Jesus says to the Father that He is the only true God, and in 1 Corinthians 8:6 Paul writes that for us (Christians) there is but one God, the Father and one Lord Jesus Christ?
In order to defend the Trinity you have to label both the Lord and Paul liars.
Here are a couple more you need to respond to:
Ephesians 4:4-8
4 There is one body and one Spirit, just as also you were called in one hope of your calling; 5 one Lord, one faith, one baptism, 6 one God and Father of all who is over all and through all and in all. 7 But to each one of us grace was given according to the measure of Christ's gift. 8 Therefore it says,
"When He ascended on high,
He led captive a host of captives,
And He gave gifts to men."
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1 Timothy 2:3-7
3 This is good and acceptable in the sight of God our Savior, 4 who desires all men to be saved and to come to the knowledge of the truth. 5 For there is one God, and one mediator also between God and men, the man Christ Jesus, 6 who gave Himself as a ransom for all, the testimony borne at the proper time. 7 And for this I was appointed a preacher and an apostle (I am telling the truth, I am not lying) as a teacher of the Gentiles in faith and truth. NAS
Catholicism claims Peter at its first Pope. Here is how Peter describes the Lord on the day of Pentecost:
Acts 2:22-24
22 "Men of Israel, listen to these words: Jesus the Nazarene, a man attested to you by God with miracles and wonders and signs which God performed through Him in your midst, just as you yourselves know-- 23 this Man, delivered up by the predetermined plan and foreknowledge of God, you nailed to a cross by the hands of godless men and put Him to death. 24 "And God raised Him up again, putting an end to the agony of death, since it was impossible for Him to be held in its power. NAS
Either Peter lied or he was pulling a bait and switch con. Especially in view of what he said in Acts 5:
Acts 5:28-32
29 But Peter and the apostles answered and said, "We must obey God rather than men. 30 "The God of our fathers raised up Jesus, whom you had put to death by hanging Him on a cross. 31 "He is the one whom God exalted to His right hand as a Prince and a Savior, to grant repentance to Israel, and forgiveness of sins. 32 "And we are witnesses of these things; and so is the Holy Spirit, whom God has given to those who obey Him." NAS
Paul expands on this in Philippians:
Philippians 2:1-11
2:1 If therefore there is any encouragement in Christ, if there is any consolation of love, if there is any fellowship of the Spirit, if any affection and compassion, 2 make my joy complete by being of the same mind, maintaining the same love, united in spirit, intent on one purpose. 3 Do nothing from selfishness or empty conceit, but with humility of mind let each of you regard one another as more important than himself; 4 do not merely look out for your own personal interests, but also for the interests of others. 5 Have this attitude in yourselves which was also in Christ Jesus, 6 who, although He existed in the form of God, did not regard equality with God a thing to be grasped, 7 but emptied Himself, taking the form of a bond-servant, and being made in the likeness of men. 8 And being found in appearance as a man, He humbled Himself by becoming obedient to the point of death, even death on a cross. 9 Therefore also God highly exalted Him, and bestowed on Him the name which is above every name, 10 that at the name of Jesus every knee should bow, of those who are in heaven, and on earth, and under the earth, 11 and that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father. NAS
The Trinity is based on a lack of understanding of how John used the term "logos". "In the beginning was the Word (logos)". The word of God is not a person any more than your words are a person. God's word was with Him in the beginning and was with Him and is Him just as your words are with you and are you. Have you ever heard of Philo of Alexandria? He was a Jewish philosopher that died about 50 A.D. John borrowed Philo's "logos" so his Greek readers could understand Christian monotheism. John's Jewish readers already understood that Jesus was the fulfillment of the Messianic prophecies that concerned a man who is the seed of the woman (Genesis 3:15), the seed of Abraham (Genesis 22:17-18), God's prophesied "servant", and etc.
Numbers 23:19
9 "God is not a man, that He should lie,
Nor a son of man, that He should repent;
Has He said, and will He not do it?
Or has He spoken, and will He not make it good?
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Jesus' favorite title for Himself was the Son of Man, which He used 160 times vs. only 4 uses of the Son of God.
Mainline Christianity needs to rethink their position since Jesus said "many are called but few are chosen" and:
Matthew 7:21-22
21 "Not everyone who says to Me, 'Lord, Lord,' will enter the kingdom of heaven; but he who does the will of My Father who is in heaven.
NAS
Deuteronomy 5:7-10
7'You shall have no other gods before Me.
8'You shall not make for yourself an idol, or any likeness of what is in heaven above or on the earth beneath or in the water under the earth. 9'You shall not worship them or serve them; for I, the LORD your God, am a jealous God, visiting the iniquity of the fathers on the children, and on the third and the fourth generations of those who hate Me, 10 but showing lovingkindness to thousands, to those who love Me and keep My commandments. NAS
Deuteronomy 6:4
4 "Hear, O Israel! The LORD is our God, the LORD is one! NAS
I will take God's word over a tradition of man any day of the week.