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Triads of gods were not uncommon in the ancient world, perhaps one of the oldest known was Sumerian. Babylon had it's triad as did Egypt.
But the Hebrew religion was different and proclaimed YHWH was one. (Deut. 6:4)

The Christian religion was not a departure from but as Jesus said, a fulfillment of the of the Hebrew. Where in the Hebrew Scriptures would Christ or the Apostles have found a triune God? They wouldn't. They could point to the O.T. for teachings about the resurrection from the dead, the role of the Messiah, the establishment of the kingdom, all basic doctrines of Christian belief but a doctrine so important that the Catholic Catechism terms, “The faith of all Christians rests on the Trinity” cannot be found.

What can be found in Jesus’ own words is how he described his relationship with God. Son to a father, servant sent forth to a master, an inferior ruler sitting at God's right hand, not having the the knowledge God has, etc. but never as an equal.

So is Jesus a created being? Yes, as Rev. 3:14 says, ‘the beginning of creation’.

not having the the knowledge God has

Well, strictly speaking, not having the knowledge the FATHER has.

I am familiar with the Jehovah's Witnesses' claim thuat when Jesus says "I and the Father are one," he means one in purpose. I never found that persuasive.

I don't usually do the 'great huge chunk o' Scripture' thing, but I think this section from the so-called "High Priestly Prayer" in the Gospel according to John, is a pretty high-falutin' way of saying "one in purpose," if that's all it means.

20 "I do not pray for these only, but also for those who believe in me through their word, 21 that they may all be one; even as thou, Father, art in me, and I in thee, that they also may be in us, so that the world may believe that thou hast sent me. 22 The glory which thou hast given me I have given to them, that they may be one even as we are one, 23 I in them and thou in me, that they may become perfectly one, so that the world may know that thou hast sent me and hast loved them even as thou hast loved me. 24 Father, I desire that they also, whom thou hast given me, may be with me where I am, to behold my glory which thou hast given me in thy love for me before the foundation of the world. 25 O righteous Father, the world has not known thee, but I have known thee; and these know that thou hast sent me. 26 I made known to them thy name, and I will make it known, that the love with which thou hast loved me may be in them, and I in them."