"2. Who is the image of the invisible God. Col1:15" = simple, the 1st Adam was the image of God, so naturally a 2nd Adam is in the image of God as well.
We will use the uncorrupted version of Heb 1:3
Who being the brightness ofhis glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;
You see mate, if you mess with the One Key of the Bible = WORD = you then mess with many true messages, just like the Heb 1:3 version you posted. The one I posted and it's explanation following, cannot be challenged via the Bible at all and gives perfect flow. Jesus repeats like a stuck record, I speak NOT of myself.
Brightness -> God is light 1 John 1:5, God is the Father of Lights James 1:17, God's word is also light Psa 119:105. Naturally, we are supposed to be children lights, which Jesus was one of. Glory in most cases is the Word of God, John 17:22 for one clear example. God's word is Spirit John 6:63. God is Spirit. Jesus was given the Words of God John 12:49 and they are Spirit John 6:63, of which we know he was given without measure John 3:34.
Resulting in, Jesus having the words of God within himself, so when he expressed them out, he Became the Express Image of God's PERSON who IS Word, The Word in John 1:1. John 14:10
Upholding things by the power of the words he was given and not to mention, the power that the God and Father, bestowed upon him.
So Kam, none of your imaginations required here, just open ones eyes and there it is, as large and life OR, let there be light ---------------------- Tell me Kam, re your faith, do they teach an eternal life option after this one,............. is on the table, so to speak? Not a maybe or if buts, but a straight out yes or no, do they teach such?