Arabic word for "Last" is "Akhir" and NOT "Khatam".
According to Quran, Prophet of Islam (PBUH) is "Khatam-an-Nabiyeen" and NOT "Akhir-ul-Nabiyeen"
I explain it with a simple example also. Take a sentence: "Bahadur Shah Zafar is the LAST of Mughal Emperors".
Now take this sentence and go to any Arabic expert. Believe me,,, NO Arabic expert shall translate it with word "Khatam"....!!!
On the other hand, there are so many examples where word "Khatam" has been applied to mean something different and other than "Last".
For example "khatam-al-Auliyah" ... this word has been used for Hazrat Ali (RA),,,, But no one takes its meaning as "Last of Auliyah"
Hope this is sufficient to explain.
Sahih Bukhari Volume 4, Book 56, Number 735: - Book of Merits - Chapter on Khatam an Nabiyeen)
المناقب - خاتم النبيين صلى الله عليه وسلم
Narrated Abu Huraira:
Allah's Apostle said, "My similitude in comparison with the other prophets before me, is that of a man who has built a house nicely and beautifully, except for a place of "ONE" brick in a corner. The people go about it and wonder at its beauty, but say: 'Would that this brick be put in its place!' So I am that brick, and I am the last of the Prophets."
This Hadith is also narrated in Sahih Muslim Hadith # 5675 under the chapter of THE FINALITY OF ALLAH'S APOSTLE (MAY PEACE BE UPON HIM) It is also narrated in Musnad Ahmed bin Hanbal Hadith # 7479, Also narrated in Sunnan al-Bayhaqi al-Kubra, Hadith # 11422]
The case is clear and has been discussed to a great length in this very thread that the issue is not of them being Muslims, the issue is, quite clearly, Social Injustice.
Please don't bring in self created theories about matters such as Finality of Prophet hood. Long before there were Qadiyani's, it was an established fact that Prophet Muhammad S.A.W was the last of prophets and there will be no more prophets. You cannot suddenly come in and claim otherwise. Might I remind you that theological argument is not allowed on this forum.