Does anyone have additional insight into Melchizedek who was referenced in the Bible?

I was talking to someone tonight who seemed very convinced that there was an eternal being named Melchizedek who can be accessed or who appears to provide insights. I know that we have some heavy thinkers and biblical scholars here, so I was interested in knowing if anyone had more info on this subject. I am really just looking for more context to provide the next time I talk with this person. His contention was that this Melchizedek was one of the Jinn referenced in the Koran. Here is what I have found:

-He was referred to as the King of Salem

-Abraham (then Abram) paid him a tenth as tithe.

-There is a reference to him as being “Without father, without mother, without genealogy, having neither beginning of days nor end of life, but made like the Son of God, he remains a priest perpetually.”

-Jesus was said to be “A priest forever according to the line of Melchizedek”

Any insights would be welcome.
Bonus points for being helpful towards my future discussions on this subject.