I would also like to add something. Speaking without knowledge can also lead one to kuffr on many occasions, and the prophet salallahualaiyhiwasallam said; someone might/can say something that he thinks is harmless, but because of it he will fall 70 years in hellfire (only the kuffar fall 70 years). Forgive me for not being able to quote the hadith properly as i dont know the exact words. What i posted is the meaning of it that i know, which remains intact.