The Obligation
Question :

Can anyone enjoin the good and forbid the evil or it is obligatory on scholars and religious leaders only?

Answer :

It is obligatory on every believer to enjoin the good and forbid the wrong if the conditions are met.

Propagating the Religion
Question :

Is it permissible for a believer to propagate the religion to non-Muslims, but of course, not in a forceful or annoying manner?

Answer :

It is recommended to spread the truth, and Almighty Allah will give great rewards to those who do such noble acts. It is reported that the Prophet said to Imam Ali (peace be upon them): “If Allah, through you, guides a single person, it is better for you than all what the Sun shines on.”