Again, people (you and I) say a lot of things. What's your point?
People say a lot of things.
God lives forever. Therefore the end of life is not being like God.
Then explain me this logic: If He is our Father, then we are his children's, right?
Right. You explained it. What is there to explain? It increases your posting to post self evident things?
True, we can not be completely like Him, because He is the Teacher and we are his students.
This is not the entire reason we cannot be exactly like Him. But 1 John 3:2 says:
The students learn from the Teacher and if they are getting better, then automatically He comes even better.
But He is not becoming better BECAUSE they are learning from Him. He is becoming "better" ("Better" is not really the correct word; "esteemed" would be a better word.) for some other reason.
Here, I will give an example. When you start to training some martial art skill, you learn from you teacher. By learning from him you forgot that he is also learning from you. Because, in his club there a lots of people with different type of characters and his duty is to accustomed to them.
The difference is that we are talking about God here. He doesn't learn from us.
So if you can see the things from different perspective, then Supreme is title just like Seraphim, Archangel and Angel. The same example is with us(humans) here on Earth... You can not have 2 leaders, there is only one who will lead the group!
"Supreme" when referring to God is not simply like some title or description. Supreme means above or over all. Talking about Jesus, Peter says in Acts 4:12:
Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved.
Saint Paul writing to the Philippians in Philippians 2:5-11:
5 Your attitude should be the same as that of Christ Jesus:
6 Who, being in very nature God, did not consider equality with God something to be grasped,
7 but made himself nothing, taking the very nature of a servant, being made in human likeness.
8 And being found in appearance as a man, he humbled himself and became obedient to death—even death on a cross!
9 Therefore God exalted him to the highest place and gave him the name that is above every name,
10 that at the name of Jesus every knee should bow, in heaven and on earth and under the earth,
11 and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.