What is the legal ruling on a system that compels members of society to pray and attend Friday prayers, and punishes those who abandon them and those who commit sins with social ostracization and deprivation from participating in celebrations and funerals, limiting the preparation and prayer for their deceased to only three people? Is it permissible to ostracize them upon their death?

No society is free of objectionable acts (munkarat). Your duty is to be a caller to goodness and righteousness, inviting people with gentleness, wisdom, and good example. In your da'wah (invitation), distinguish between those for whom a kind word is effective and those for whom strictness is beneficial. Differentiate between a sin that causes one to be considered a fasiq (open transgressor) and a sin that causes one to be considered a kafir (disbeliever). One who abandons prayer must be compelled to attend every Friday prayer, for the Prophet, peace and blessings be upon him, said: "Whoever among you sees an objectionable act, let him change it with his hand; if he is unable to do so, then with his tongue; and if he is unable to do so, then with his heart, and that is the weakest of faith." Funeral gatherings are an innovation that must be changed.