Umar ibn al-Khattab (RA) said: “Allah’s Messenger said (Allah bless him and give him peace): ‘Do not extol me as the Christians extolled [Jesus] the son of Mary. I am merely a servant,’ so say: ‘[He is] Allah’s servant and His Messenger.’”
Isa (AS) was the son of Maryam (AS) and has been elevated by other faiths. Muslims believe that Prophets are servants of God, they convey His Message and are Messengers. Our Beloved (SAW) made sure to emphasise this so that his status was not elevated afterwards.