Some modern Muslims have objected to the term, saying that the term was not used by Muhammad himself or his earlier followers, and that the religion teaches the worship of God alone (see shirk and tawhid) and not Muhammad or any other of God's prophets, according to Muslim beliefs. Thus modern Muslims believe "Mohammedan" is a misnomer, "which seem to them to carry the implication of worship of Mohammed, as Christian and Christianity imply the worship of Christ." Also, historically the term al-Muḥammadīya has been used in Islam to denote several sects that have been considered heretical by mainstream Islam