Is a person sinful if they do not convey religious knowledge due to the lack of a suitable method, or fear of ridicule, or entering into a heated discussion and dispute? And does doubt about sinfulness lead to apostasy from the faith?

Teaching and advising fellow Muslims is a religiously commanded act, whenever one is able to do so and hopes for their benefit. Advice is thus obligatory to the extent of one's capacity, if the advisor knows that his advice will be accepted and is safe from harm. Jurists have held that advising Muslims is obligatory, and it is an individual obligation (fard ayn) according to the Malikis if benefit is expected. This duty should not be abandoned on the pretext of not knowing the method or fearing ridicule, unless there is a legitimate fear of harm. If one is certain that their advice will be accepted, there is a difference of opinion regarding the obligation to forbid them from wrongdoing, and failing to teach does not constitute disbelief.