You have heard of the Hadith and the prophecy that Muslims will lose their faith in the latter days yes?
Then Allah will raise a Messiah and Mahdi like Jesus who will come in his spirit to reform and revive the Muslim Ummah.
So we Ahmadis believe that that same Messiah and Mahdi has come in the form of Jesus as prophesied by the Holy Prophet (saw). His name is Mirza Ghulam Ahmad.
He fulfilled the signs and the prophecy and has come as the Messiah. Those who have recognised him and accepted him and conveyed the Salaam of the Holy Prophet to him, as the Prophet instructed, have become enlightened and their faith has been lifted and regained.
‘Whoever among you meets the Messiah should convey my greeting to him.’ (Dar Mansoor). If you look at the Muslims who have rejected him, they are the pit of darkness and ignorance. Not all of them, some individually may still be good and righteous but as a whole they have become corrupt.
Look at Pakistan where Ahmadis are denied professing the kalima and the kalima is wiped off mosques. Look at the state of the country. It is destroyed. Corrupt politicians and Mullahs have destroyed the country along with severe floods ever seen in Pakistan.
The time of the coming of the Messiah was predicted in the 14th century and many scholars were expecting him then. There as only one claimant and his community has spread worldwide from a tiny hamlet in Qadian, India.
The sun and moon, another sign, were eclipsed to show the coming of the Messiah and Mahdi. He came directly east of Damascus near a white minaret as the prophecy foretold. He was a follower and great lover of Muhammad and had the same name, which is even in the Qur'an - Ahmad.
These are the signs which have been fulfilled. Now if you look at Ahmadiyya, they practice Islam as it should be practised. They are praised by all groups except the Muslims. Just as the Jews rejected Isa, the Muslims have rejected Ahmad. History of Messengers always repeats itself.
Placing his hand on Hadhrat Salman (ra) who was a Persian, The Holy Prophet is reported to have said, ‘If Faith were to go up to the Pleiades, a man, from among these would surely bring it back’ (Bukhari). He was of Persian descent.
This was the command of the Holy Prophet:
‘When you find the Mahdi, perform bai’ah at his hands. You must go to him, even if you have to reach him across ice-bound mountains on your knees. He is the Mahdi and the Caliph of Allah. (Ibn Maajah). Now only one worthy claimant has come, does it not behove you to fully recognise him and accept him after detailed investigation into his claims and intensive prayers for guidance from Allah?
When The Holy Prophet told the Muslims that in the latter days there will be 72 sects all destined for the fire but the 73rd will be the only one on the right path, a companion asked how will they distinguish which one is on the right path. The Prophet (saw) replied, ‘They are the people who will follow my practice and that of my companions.’ (Tirmidhi)Ahmadis claim to be that 73rd sect.
http://www.alislam.org/http://www.alislam.org/topics/messiah/index.php