Even in the Bible, ʿĪsá prays to God like a Muslim:
3:35–48, 19:16–34, 3:48–55, 2:116
Jesus said, “Indeed, I am a humble servant of God. He has given me the Scripture and made me a prophet. And He has made me blessed wherever I am. God has commanded me to pray, to give alms as long as I live, and to cherish my mother. He did not make me domineering or graceless. And peace is on me the day I was born, the day I will die, and the day I am raised alive.” (Qurʾān 19:30-33)
Islam is unbroken chain:
"And behold! I inspired the disciples to have faith in Me and Mine Messenger [Jesus]: they said, 'We have faith, and do thou bear witness that we bow to Allah as Muslims'". (5:111)
Muḥammad ﷺ was renewer of ancient tradition. Not introducing new religion.