Was John the Baptist the apostle John?
No; they were different people.
The apostle John is not the same person as John the Baptist The apostle John wrote the books of Revelation,John, and the 1st,2nd,and 3rd books of John The apostle John was the last apostle living on earth The apostle John referred to himself along with his brother James as the "sons of Zebedee". One reason for this was so that he was not confused with John the Baptist.
A: No. The Gospel of John was written anonymously long after the death of John the Baptist. It was attributed to the apostle John, son of Zeberdee, later in the second century. Although modern New Testament scholars say that the Gospel could not have been written by the apostle John it also could not have been written by John the Baptist. We do not know who really wrote John's Gospel.
Most people know that Jesus and John the Baptist were second cousins, but few know that the Apostles James and John were Jesus' first cousins. For more information on this subject, click on this link. James and John were brothers who were the children of Mary (or Salome) of Clophas who was thought to have been the brother of Saint Joseph.
No, John the Apostle and John the Baptizer were two different people. John the Baptizer was arrested and beheaded by Herod, whereas John the Apostle lived past the crucifixion to write the Gospel, his 3 letters and Revelation. John the Baptist beheaded Mark 6:27 Mark 14:33 John the Apostle with Jesus in Gethsemane.