The prophet spoke to the crowd.
Jesus spoke aramaic
You are right that the name you call God is not important - as long as you speak of the same God - the One and Only God. BUT: God spoke to Moses and said that He will send other prophets with other messages over time. He spoke to Jesus after Moses. He spoke to Muhammad after Jesus, etc. So each new prophet that came brought a new message - an updated message. It is important to follow each new prophet as they come. Muhammad was the only prophet who said: "I am the last prophet". www.freequran.org
Yes, Prophet Isa in Arabic is Prophet Jesus.
He was an Arab and spoke Arabic language.
No Jesus was not a prophet, he was the son of god.
The Prophet Samuel, after King Saul had him raised from the dead
His best prophecy was telling the people 700 years before the birth of Christ that Jesus would be born to save the world. He also spoke of Jesus trial.
Isaiah
First of al Jesus is not a prophet.
The Jews of Medina most commonly spoke in Arabic at the time of the Prophet Muhammad.
Jesus