There are three things about Imam Mehdi that, unless we believe in, our faiths can never reach their ultimate dome:
1) Imam Mehdi is the creation of Allah
2) It's as if he were Prophet Mohammad
3) He shall be the son of Ali from his line of Fatima (The daughter of the Prophet)
Christians believe in three things:
1) That the Christ is the raised of wisdom
2) That he would not commit any of our sins
3) That we are as his children
Christ and the Mehdi are the same. They would recompense each other in any circumstances. To believe in the Christ as Mehdi is also the correct answer
But then there is the rejector. If they would believe in the Christ, and say we willn't have to believe in the Imam Mehdi, they would misjudge.
Also called, Hadi, Imam Mehdi means to be the right guide. Mahdi would proclaim it as the ultimate guide. He'd always come as the messiah.
In Surah Al-Noor it says:
Allah is the light of the heavens and the earth; a likeness of His light is as a niche in which is a lamp, the lamp is in a glass, (and) the glass is as it were a brightly shining star, lit from a blessed olive-tree, neither eastern nor western, the oil whereof almost gives light though fire touch it not-- light upon light-- Allah guides to His light whom He pleases, and Allah sets forth parables for men, and Allah is Cognizant of all things. (Ayat 35)
So whereas to go to create in it a light like Allah?
The Love of the Ahl-Ul-Bayt:
Imam Ali Ibn Abi Talib said:
"The love of the light is cognizant over all things, with the virtue over itself.
The Love of Yunus;
The love of Ahl-ul-Hadees
The love of Khatta (Khana-e-Mecca)
The love of Ahl-e-Hidayat
"Love thy brother, and thine kin shall be divine."
When in any nature, the human soul was requested to betake a request, they all wished for Allah's will. So we took this partaking request and bequested Allah's will and that was to believe. What is the height of a believer? When he gets to believe.
To be continued...