It appears you are poorly educated in The Ahmadiyya Movement in Islam and the claims of Ghulam Ahmad (pbuh) or may have just studied it in passing.
I have not studied much from him. As far as I know, there is no online source, where I can read his writings in english. Did he really say that:
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"I do not claim that I am the same Mahdi who will come according to (words of Hadith) 'from the son of Fatima and from my progeny' etc." (Braheen-e-Ahmadiyya V, Roohani Khazain vol.21 p.356)
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"We admit this that several Mahdis may have come before and possibly will come in future as well and probably someone by the name of Imam Muhammad may also appear." (Roohani Khazain vol.3 p.379)
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"It is possible and quite possible that at some time in future such Messiah may appear upon whom the literal words of Hadith(of Holy Prophet) fit, because this humble self has not come with the Reign and Command of this world, but with poverty and humility." (Izala-e-Auham, Roohani Khazain vol 3 p.197)
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"It is possible that in future no Messiah may come. It is possible 10,000 more Messiah may come and one of them may descend in Damascus." (Izala-e-Auham, Roohani Khazain vol 3 p.251)
Sorry for quoting anti Ahmadiyya sites, but this is the only stuff I could find. I just want information about these things, so it is not a debate I think.
Mirza Ghulam Ahmad Qadiani conducted a
Mubahala with Maulana Abdul Haq Ghaznavi, in Eidgah ground of Amristar on Zeeqadah 10, 1310 A.H.
Mirza Ghulam Ahmad Qadiani had said on Oct. 2, 1907 (7 months, 24 days before his death) that "the liar among the participants in a
Mubahala dies during the lifetime of the truthful." (
Majmuai-Ishtiharat Mirza Qadiani, Vol. 9, P.440)
Mirza Ghulam Ahmad Qadiani died during the lifetime of Maulana Abdul Haq Ghaznavi on May 26, 1908
Is this accurate?
The third century from today would not have elapsed when all who wait for ‘Isaa’ [Jesus] to descend from heaven, whether Muslims or Christians, will give up this doctrine in hopeless despair and disgust.
So humanity will know soon
You said that Ghulam Ahmad has just created another sect in Islam and that is sinful per the Quran. Yes, dividing up the religion in sects is against the teachings of the Quran. However, here is a prophecy and hadith of prophet Muhammad: "
Every sect thinks, that they are the one. If you believe in sunni hadiths, you should know, that Mahdi will be a descendant of Muhammad. That's probably the most important attribute of Mahdi in all Hadiths.
Bahaullah's own claims and writings are not even about the coming of the Messiah or prophet of God in latter-days. He claims to be some novelty as a manifestation of God apart from the cycle of prophets in the past which is contradictory to the prophecies of Muhammad (pbuh) and Jesus (pbuh) on the coming of the Messiah.
Baha'u'llahs claims are exactly about him coming as the messiah in the latter days.
They read the Evangel and yet refuse to acknowledge the All-Glorious Lord, notwithstanding that He hath come through the potency of His exalted, His mighty and gracious dominion. We, verily, have come for your sakes, and have borne the misfortunes of the world for your salvation. Flee ye the One Who hath sacrificed His life that ye may be quickened? Fear God, O followers of the Spirit, and walk not in the footsteps of every divine that hath gone far astray. Do ye imagine that He seeketh His own interests, when He hath, at all times, been threatened by the swords of the enemies; or that He seeketh the vanities of the world, after He hath been imprisoned in the most desolate of cities? Be fair in your judgement and follow not the footsteps of the unjust.
- Bahaullah, Most Holy Tablet (Tablet to the Christians)
O Jews! If ye be intent on crucifying once again Jesus, the Spirit of God, put Me to death, for He hath once more, in My person, been made manifest unto you. Deal with Me as ye wish, for I have vowed to lay down My life in the path of God. I will fear no one, though the powers of earth and heaven be leagued against Me.
- Bahaullah, Gleanings from the writings of Bahaullah, p. 101
God never tricked the Christians, there were no official Christians at the time-- they all claimed to be Jews.
So God tricked the jews or what ever followers of Jesus called themselves at that time. The followers of Jesus all believed, that Jesus died on the cross, was dead, and appeared to people after 3 days as a spirit. So if this didn't happen, God would have tricked the followers of Jesus into a false belief. And if the bible was false, then you still would need to explain, why the Quran says, that Jesus didn't die, but was taken up to heaven.
There are no two messianic figures, there never was such a thing before in history. Another reference for the latter-days Messiah is known as Mahdi, which simply means "guided".
The shiites and sunnites both believe, that Mahdi and Jesus are two persons.