While the concepts of a personal call to "believe in me" and to "follow me" both appear in the Fourth Gospel, the Synoptics do not feature a Jesus who comes up to you and says "believe in me" like John does. In John the disciple is now one who believes, because Jesus in his resurrected glory is no longer possible to follow in the Synoptic sense.
Let not your heart be troubled: ye believe in God, believe also in me.
-- John 14:1
Simon Peter said unto him, Lord, whither goest thou? Jesus answered him, Whither I go, thou canst not follow me now; but thou shalt follow me afterwards.
-- John 13:36
The Fourth Gospel in fact is replete with phrases involving personal "belief" in Jesus whereas the Synoptics contain relatively few involving belief, let alone commands by Jesus to "believe" in him. And we do not have in the Fourth Gospel either what could be called a robust memory of the tradition involving "following". This is because the eschatological urgency involved in the command to follow has disappeared for the Fourth Gospel.
It is the Synoptics which feature a Jesus who calls people to come with him on the road as the distinctive feature of discipleship. The old world is imminently passing away in judgment. The few who answer his call to follow will be saved. But in John discipleship is now open to the many, to anyone in fact who reads the book and believes, which is the new meaning of following.
But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.
-- John 20:31
