I'm going through an interesting case where I'm unsure as to what is the Islamic definition of a Messiah.
I'm beginning to understand the reasoning behind the support of Jesus (عليه السلام) being God, the Trinity, and Original Sin Doctrine the Christians espouse despite its irrationality in general.
It all hinges on the Christian understanding of Messiah where Jesus (عليه السلام) fulfilled 3 offices of Messiahship: Prophet, Priest, and King. What Christians believe in is the theology of Mono-Messianism when it comes to Jesus (عليه السلام) as not just The Messiah, but The One and Only Messiah, The Seal of All Messiahs before him. Similar to how Prophet Muhammad (صلى الله عليه وآله وسلم) is the Seal of All Prophets before him.
Historically, under Judaism the idea of The Messiah holding all 3 offices has never been a general consensus where there were many Messiahs before Jesus and they never hold all 3 offices at unison. And for the interest of Christians when reading the Tanakh of the Jews and how many Messiahs came before Jesus where none of them hold all 3 offices at the same time, it would stand to reason that the office of both King and Priest are polar opposite offices.
One can be a Messianic Prophet and a Priest? Sure look at Prophet Isaiah (عليه السلام). One can be a Messianic Prophet and a King? Sure look at Prophet David (عليه السلام) and Prophet Solomon (عليه السلام).
How can there be such a thing as a Messianic Prophet that is both a Priest and a King? Isn't this equivalent to Nimrod (Namrood) reasoning where he claims to Abraham, "I am justice where I give life and bring death. I am LifeGiver and DeathBringer given how I am Just."
I think this is a question that some Christians think about and hence that's where they attempt to reconcile the issue by saying Jesus is God along with the Trinity and Original Sin Doctrine to maintain that Mono-Messianism theological position of Jesus fulfilling the 3 offices of Messiahship: Prophet, Priest, and King. But most importantly on the notion that Jesus is both a Messianic Priest and Messianic King at the same time.
However, what about Poly-Messianism? Wasn't that a theological discourse within Judaism at some point when it came to the Jews understanding of The Messiah?
So what I'm trying to understand is the Islamic definition (both Sunni and Shia) of Messiah. Jesus (عليه السلام) is The Messiah that is self-explanatory in The Quran and the Quran furthermore chastises the Christians and Jews to not commit excess in their religion where they are re-interpreting the theology when it comes to the definition of Messiah where you must be God in order to be The Messiah along with other definitions.
However, is Jesus (عليه السلام) The One and Only Messiah that is the question? Or is there another entity alongside Jesus who is also The Messiah just as much as him?
I've been reading a bit on Shia Hadith Literatures where The Mahdi (عليه السلام) will judge the people like Prophet David (عليه السلام) and Prophet Solomon (عليه السلام) have judged their people. There's also another Hadith narration where a congregation prayer commences (aka Friday Prayer). Jesus (عليه السلام) will pray behind The Mahdi (عليه السلام) during this congregation prayer. When The Mahdi (عليه السلام) asks Jesus (عليه السلام) to lead the congregation prayer since He's The Messiah, Jesus (عليه السلام) will decline the offer to The Mahdi (عليه السلام) where The Mahdi (عليه السلام) will lead the congregation prayer.
What does this mean? Is The Mahdi (عليه السلام) also The Messiah just as much as Jesus (عليه السلام)? Does The Mahdi (عليه السلام) have Bani-Israeli ancestry similar to that of a Judean (Yahoodi)?