“Giving congratulations on the special events that are specific to the disbelievers, such as congratulating them on their holidays by saying, “Blessed holiday for you,” or other similar greetings, is considered forbidden by the agreement of the scholars. Even if the one who states it is free from any aspect of apostasy, it is still a forbidden act and it is the same as congratulating them upon their prostrations to the crucifix. In fact, that is one of the greatest sins in Allah’s (Subhaanu wa ta’ala) sight. That is a greater sin than congratulating them for drinking wine, having illegal sexual intercourse and so on. Many of them who are not very religious do such things and they do not know how evil what they are doing really is. Whoever congratulates another human for any sin, heresy, or act of apostasy has exposed himself to the punishment and anger of Allah (Subhaanu wa ta’ala). The pious people from the early scholars would avoid congratulating the oppressors when they received positions of authority or the ignorant when they were given judicial or teaching positions in order to avoid the punishment of Allah (Subhaanu wa ta’ala) and falling from His Grace. If a person would be compelled to go to such people to repel any evil that he expected from him, only to speak well to him and to ask Allah (Subhaanu wa ta’ala) to guide him, there is nothing wrong with that.”