Thanks Parker (hope you’re well BTW) as I think what you’ve given us in your post is a good example of what the OP is talking about. Obviously you see no contradictions in your logic nor experience cognitive dissonance regarding what you see/understand. But we see a lot - in large part simply from the conclusions you draw from your reading of Bible verses and the eisigesis that (at least in my opinion) you perform below.
They are only contradictory if one doesn’t understand Hebrews 6:20 through Hebrews 7:3. The words “for ever” and the words “having neither beginning of days, nor end of life” have to do with the priesthood held by the Son of God, which He received from His Father, and is without beginning and without end, or is in other words “everlasting”.
I think we understand Hebrews 6:20 - 7:3 quite well. You may be right in thinking that God gave Christ the priesthood but that’s not in the text (please show us if we’re missing it). Nor is it implied in 7:3 in stating “Without father, mother, or ancestry, without beginning of days or end of life, thus made to resemble the Son of God, he remains a priest forever” that the
priesthood is everlasting. This is your eisigesis Parker - it ain’t there my friend.
The rabbis maintained that anything not mentioned in the Torah does not exist and since the OT nowhere mentions Melchizedek’s ancestry, birth or death the conclusion is drawn that he remains forever. The rest of Hebrews 7 tells us basically that Christ is a new order of priest in that He’s different from the Levitical priests, his priesthood is perfect, brings us a new covenant (different from the Mosiac law) and that he is our priest forever (see 7:20 - 25). The verses main point is that Christ is our perfect High Priest, not that Christ is the holder of a priesthood.
It may also be good to make clear that “the order of Melchizedek” means “in the manner of Melchizedek.” (“Order” does not refer to a religious order, as there was no such thing in Old Testament days.) The only “manner” shown by Melchizedek was the use of bread and wine. A priest sacrifices the items offered—that is the main task of all priests, in all cultures, at all times—so the bread and wine must have been what Melchizedek sacrificed. Which fits in perfectly with 1) Christ making clear for us in John 6 and Luke 22 that His body and blood through the Eucharist are efficacious for ongoing salvation, 2) that Christ is our
only high priest as He is eternal (Heb 7:23-24), 3) the priesthood does not pass away because Christ is eternal - not the other way around (7:24) and 4) by implication that there is no need for another priest - so the LDS Melchizedek priesthood is unnecessary.
The passages in Mormon and Moroni have to do with miracles, but could just as well have to do with prophets and with the fact that God upholds His priesthood on the earth and that miracles are wrought by faith, through the power of the priesthood, and that prophets teach the people and receive the ministry of angels by the power of the priesthood, which priesthood is after the order of the Son of God.
Wow! I expect, almost by definition, for LDS to read things into the Bible that aren’t there but you’re doing that Parker with the BoM. Moroni 8 has nothing to do with miracles, prophets or the priesthood - it’s about JS smacking infant baptism. Moroni 8:12 says little children are alive in Christ from the foundation of the world, if that is not so then God is a partial God and also a changeable God (my paraphrase). And God’s non-partiality is reinforced in 8:18 where Mormon again proclaims that God is not partial or changeable. Nothing about everlasting priesthood in that chapter.
Mormon 9 is about God being a God of miracles, that men need to believe in Him, turn to Him, that revelations, prophecies, gifts, healing, etc have not “left the earth” (my words), etc. Mormon 9:9 -10 state quite clearly that God is the same yesterday, today and forever, that in him there is no variableness and if you imagine God as changeable you have not imagined a God of miracles. 9:19 says He changeth not; if so He would cease to be God…The chapter goes on regarding several other things but nowhere that I see does it get into what you’ve referred to Parker. And it states quite clearly that as least for Mormon he understood God to be unchanging.
The power of the priesthood is unchangeable, everlasting, without beginning of days or end of life, and will endure through all eternity. Those who receive it and are faithful have entered into the covenant that is an everlasting covenant, a priesthood covenant.
So I think your post is a good example of the OP’s point. You seem to be reading things into the text that are not there and are either not aware of it or somehow justify it based on eisigesis, text taken from the D&C or other LDS scripture, modern LDS interpretation of the BoM, or whatever. The Bible is not talking about the priesthood being unchangeable and everlasting - it is talking about Christ/God being unchanging and everlasting and Christ being the only worthy one to hold that high priesthood - your emphasis is in the wrong place.
The BoM text SteveVH cited does not support your post. If God was once a man then by definition, unless He was a different type of man than men on earth, he changed - he had to. Yet the BoM clearly states he doesn’t change. Yet you seem to be ok with both His unchanging"ness" from the BoM and His changing"ness" from King Follett. That’s Steven’s point - and many of the other posters points. If you reason in an illogical way for most people that won’t work for long and that’s a very common reason why people leave LDS - many, many in our church. That’s the OP’s point - how (and I would add why) would you continue to do that?