Christian’s are disciples of Jesus they believe in him in what he was saying in what he did n what were told happened
that’s what defines a Christian they heard about Jesus and believe in him they believe he is the son of God the Lord in the flesh the one true God.
A follower of Buddha would be defined as a Buddhist because that’s what those terms mean
“Christ” ianity “
“ Budd” “hism”
“Muslim “ “ Islamic”
these terms re meant to define the belief systems of the person “Christian’s “ are disciples of Jesus of Nazareth his followers . They were only termed to be “ Christian “ as a shorter way to say “ the disciples of Jesus “ the term Christian literally means “disciples of Christ “
See “Christian” is a term beginning right here and it defines the disciples of Christ
“And it came to pass, that a whole year they assembled themselves with the church, and taught much people. And
the disciples were called Christians first in Antioch.”
Acts 11:26
your question is asking if a disciple of Buddha is a Christian , no they would be a “buddhist “ a follower is a more modern phrase for disciple
buddha like Jesus was a teacher who taught a philosophy of life and existance what some call religion. Followers of his philosophy the teachings of Buddha are his disciples and follow and believe in his doctrine
the same with Christian’s they believe in Jesus and are his followers because they believe in him and his promises of life everlasting