Holy Prophet Sydena Muhammad sallillahu alaihi wa sallam is the final seal of all the Prophets. His (swm) evidence is from Allah swt. Mentioned in the Holy Book:
1. “Muhammad is not but a messenger. [Other] messengers have passed on before him. …” [Quran, chapter 3, verse 144]
2. “Muhammad is not the father of [any] one of your men, but [he is] the Messenger of Allah and last of the prophets. And ever is Allah, of all things, Knowing. (40)”
[Quran, chapter 33, verse 40]
3. ” And those who believe and do righteous deeds and believe in what has been sent down upon Muhammad – and it is the truth from their Lord – He will remove from them their misdeeds and amend their condition. (2)”
[Quran, chapter 47, verse 2]
4. “Muhammad is the Messenger of Allah; and those with him are forceful against the disbelievers, merciful among themselves….”
[Quran, chapter 48, verse 29]
And [mention] when Jesus, the son of Mary, said, “O children of Israel, indeed I am the messenger of Allah to you confirming what came before me of the Torah and bringing good tidings of a messenger to come after me, whose name is Ahmad.” But when he came to them with clear evidences, they said, “This is obvious magic.”
[Quran, chapter 61, verse 6]
He was mentioned five times. Four times as Muhammad and once as Ahmad.
He (swm) came as a mercy for all mankind. Allah (swt) commands believers to follow him (swm). Allah swt says in the Holy Quran:
And We have sent you not except as a mercy for all the worlds. (21:107)
Indeed, Allah and His angels shower blessings on the Prophet. O you who believe! Ask blessings on him and salute him with a worthy salutation. (33:56)
Say (O Muhammad): “If ye do love Allah, Follow me: Allah will love you and forgive you your sins: For Allah is Oft-Forgiving, Most Merciful.” [3:31]
Those who lead and hold influence over the ummah, can erect other personalities as alternative role models, but only after contradicting with evidences from the Holy Quran.