Could you quote any scholars for this ruling please? Brother Maulanax are you a mufti? If so, what is your real name or is this the opinion of one because brother Aqdas has said something different. I ask this because there are many people who deny this. There also those who say it is khabar of ghaib not ilm. There needs to be an answer from a known mufti not anyone on the Internet unless one of the admins happens to be one.
to totally deny it is kufr because it is denial of the qur'an. so, if someone says no one has been given ilm al ghayb at all by Allah, this is kufr.
if you deny that rasoolallah SAW has ilme ghaib then it will take you out of ahlus sunnah wal jamaah but not out of islam so it should not be kufr! although it may lead you into hell.
here, the khabeeth is the denier of ilm al-ghayb for rasulAllah sallAllahu 'alaihi wasallam and the tayyib is one who affirms. http://tinyurl.com/dmwdju