"And they shall not teach every man his neighbor, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest." (Hebrews 8:11 KJV)
"And we know that the Son of God has come, and he has given us understanding so that we can know the true God. And now we live in fellowship with the true God because we live in fellowship with his Son, Jesus Christ. He is the only true God, and he is eternal life." (1 John 5:20 NLT)
Now, about that message I heard regarding Jesus being fully God and fully man: there is a huge difference between the order of His manifestation or birth, as to whether He was a man that was born God, or God that was born as a man. Not that we have to figure out which one it was, because if we just listen to what Gabriel said to Mary, we will know full well that Jesus was God, who came to the earth as a man!
O, it gets even better, because not only did He come into this world as a man, He came lowly and fragile, in the form of a little baby! Imagine the incredible power that was held in the arms of His mother, as she nursed Him, changed Him, and rocked Him to sleep. Isaiah was shown this, as he described it in his writing about the Savior: "My servant grew up in the LORD'S presence like a tender green shoot, like a root in dry ground. There was nothing beautiful or majestic about his appearance, nothing to attract us to him." (Isaiah 53:2 NLT)
Thinking about this, incredible birth, it is amazingly the same way He died! He came as a fragile little baby, not yielding the power of The Almighty; and He died the same, totally humble and not yielding that mighty power, which He could have used to save Himself! This is the most amazing thing that could ever happen! Yet, God had this planned out from the very beginning; even before He created the earth, it was His plan all along: To make a way that we could be holy, as He is Holy, so that He could have real fellowship with us all!
I know that I don't know enough to teach or preach, but I do believe in the God that shows me what I need to know; that is what He has done from the very beginning! Yes, we will see Adam and Eve in heaven, because they too knew God and believed in the Savior that was to come; which was why Adam changed the name of his wife, from "woman," which meant "she was taken from man," and changed her name to "Eve," which meant, "because she would be the mother of all who live."
If you don't know what that means, or why it is so interesting to think about; it is because there was not going to be a man involved in the birth of The Savior; the Seed would be of God...
"See, my servant will prosper: he will be highly exalted. But many were amazed when they saw him. His face was so disfigured he seemed hardly human, and from his appearance, one would scarcely know he was a man. And he will startle many nations. Kings will stand speechless in his presence. For they will see what they had not been told; they will understand what they had not heard about. Who has believe our message? To whom has the LORD revealed his powerful arm?" (Isaiah 52:13 - 53:1 NLT)