For the most part, they weren't. Jewish tradition is that the founders of Christianity had very little impact upon the Jewish community - which is why the early Christians soon had to seek adherents among the non-Jews. Most Jews at the time (and that means well over 90%) never heard of Jesus, Paul, John, et cetera.
Answer:
Within the Christian narrative, Jesus claims that John the Baptist was a reincarnation of Elijah the Prophet who needed to come in order to inaugurate the coming of the Messiah. However, John the Baptist himself refused to validate this view. Given that John the Baptist was well-received in Jewish circles, this served to confuse the Jews about Jesus' true nature as the Messiah.
John the Baptist
John the Baptist was baptizing in obedience to God. God had commanded John to perform what's referred to as a "baptism of repentance," to prepare the way for the coming Messiah. In effect, John was "helping" God, the Jews, and Christ as well.
There is a St. John the Baptist but no St. John Paul the Baptist.
John preached baptism for forgiveness of sins for those repenting, confining his baptism to Jews and proselytes to the Jews' religion. (Mark 1:1-5; Acts 13:24)
John the Baptist was never married.
none
Actually nobody did baptize John the Baptist.
John the baptist then they are cousins.
Jesus and John the Baptist were cousins.
John the Baptist's cousin is Jesus Christ.
No, John the Baptist is not Jesus' brother. John the Baptist was a cousin of Jesus, as their mothers, Mary and Elizabeth, were related.
The baptism of John the Baptist was a baptism of repentance for Jews. John was preparing the way for Messiah. The Jews believed that Messiah was going to set up His kingdom on earth as written in the Old Testament. Messiah was the coming King, who would defeat Israel's enemies. John was calling the Jews to repent, meaning to renew their commitment to The Law and prepare for Messiah. This made John's baptism both personal and national in nature. To be baptized, one had to be a Jew, or prepared to convert to Judaism, to acknowledge the Law as the guiding principle for life and to submit to the coming Messiah.