What is the ruling on praying behind an Imam who does not wish for the questioner to pray behind him, nor does he return his greeting, due to a disagreement about his unwillingness to assign someone to translate sermons, and his refusal to lower his voice and that of his companions when supplicating aloud and in congregation after the prayer, knowing that the mosque is sometimes not opened for Fajr and Isha prayers and is used for discussing worldly matters?

Prayer behind the Imam is valid as long as he fulfills its pillars and conditions, and it is not permissible to accuse him of corrupt intention. The fundamental principle is that a Muslim leads people in prayer seeking reward, not to accumulate money. Translating the Friday sermon during the khutbah (definition) is not permissible, but translating lessons or the sermon after the prayer is permissible. Group supplication, raising the voice with it, and reciting Al-Fatiha in congregation after every prayer are impermissible acts and fall within the category of innovation (bid'ah), and the Imam should abandon them. The mosque must be opened for Fajr and Isha prayers, as mosques were built for the establishment of prayer, and closing them contradicts this. If the Imam is unable to open the mosque, he should delegate someone else. It is recommended to be gentle and kind in giving advice.