If you belong to OC Muslim category and want to apply in Muslim minority colleges then it's mandatory to have a minority certificate to get admission. If you just write that I am a Muslim or show caste certificate that would not be enough. Without the certificate you will not get any benefits.

Dear candidate ,
If you belong to the OC Muslim category and wish to apply for admission in Muslim minority colleges , you must have a minority certificate to claim a seat under the Muslim minority quota . Being from the OC category means you do not get caste based reservations , but minority quota is separate and requires official proof that you are from Muslim community. This certificate is issued by your state government and is needed during admission, counselling and scholarship applications . Without it , you will be considered only under the general OC category and cannot avail minority - specific benefits .