Ibn Uthaimeen says:
Anyone who abuses the religion or abuses Allaah or His messenger, then he is a kaafir - out of the fold of Islaam, and we seek refuge in Allaah (from that). (This is the case) even if he believes he is a Muslim. Even the people of knowledge have said: Indeed whoever abuses Allaah, then he is a kaafir, even if he was joking. And the evidence they use is His (Subhaanahu wa Ta'aala) saying:
{If you ask them, they declare: "We were only talking idly and joking." Say: "Was it at Allaah, and His Aayaat and His Messenger that you were mocking?" Make no excuse; you have disbelieved after you had believed}, [Soorah at-Towbah, Aayahs 65-66].
So, everyone who abuses Allaah or His messenger, or His Book, or His religion, or any of the prophets (sal-Allaahu `alayhe wa sallam) then he is a kaafir. And it is upon these people to repent to Allaah (Subhaanahu wa Ta'aala) and return to Him (to Islaam), otherwise they will be given the glad tidings of the Fire of Hell.
We ask Allaah to guide them, and Allaah is the Expounder of success.
Shaykh Ibn 'Uthaymeen
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Aljazairy says:
Everyone that reviles Allah the Almighty, or reviles a Messenger
from His messengers , or an angel from His angels, then verily he
has disbelieved.
Everyone who rejects the Lordship or the divinity of Allah
the Almighty, or His sending a Messenger from the messengers,
or claims that a prophet will come after the finality of the prophets,
our leader Muhammed :arabic5:, then he has disbelieved.
Everyone who denies an obligation from the obligations of the agreed
upon Islamic Law, such as prayer, or zakat, or fasting, or pilgrimage,
or kind treatment of parents, or striving in Allah's way, then he has
disbelieved.
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The people mentioned above are considered apostates.
You should not hang around people like this, as they are far astray,
and they will misguide you.
And Allah knows
