Is it permissible to participate in or manage online forums that contain the rituals of other sects or violations of Sharia, such as pictures of women and music? And is this considered to fall under the principle of "To you be your religion, and to me be mine," or is it obligatory to denounce the evil?

It is obligatory to eliminate religious transgressions, as the Prophet, peace and blessings be upon him, said: "Whoever among you sees an evil, let him change it with his hand; if he cannot, then with his tongue; if he cannot, then with his heart—and that is the weakest of faith." Working in administration and forums where the permissible mixes with the impermissible is not allowed, as it involves participation in sin. However, one can work if the forum has many users and leaving it would increase corruption, provided advice is offered to the administrators and users.