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or syas their are other prophets after Mohammad(SAW)
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This is an act of Kufr which takes a person outside the fold of Islam. Proof is the fact that Abu Bakr r.a. fought Musaylamah and his followers because he claimed to be Prophet and his followers considered him a Prophet.
Also declaring Takfeer is a
very heavy matter. There are rules and pre-conditions for it which must be met and all blocks to it removed before a person can declare another person a Kafir. Secondly, we do not declare a person a Kafir simply because they have commited a major sin. Takfir is matter which should not be dealt with by the laymen, and it should be left to the Ulema.
I suggest you listen to this lecture Insha'Allah, it explains the matter very well:
http://www.islamhouse.com/en/audio/mp3/en5380.mp3
From:
http://www.islamhouse.com/en/islamle...qidalislam.htm 
هَلْ جَزَاء الْإِحْسَانِ إِلَّا الْإِحْسَانُ؟
Is there any reward for good other than good?
[ar-Rahman: 60] O Allah, Lord of Jibril, Mika'il and Israfil, Creator of the heavens and the earth, Knower of the unseen and the seen, You will judge between Your servants concerning that wherein they differ. Guide me with regard to that wherein there is dispute concerning the truth by Your leave, for You guide whomsoever You will to the straight path.
Oh Allah, I seek refuge in You lest I misguide others, or I am misguided by others, lest I cause others to err or I am caused to err, lest I abuse others or be abused, and lest I behave foolishly or meet with the foolishness of others.