Christianity is an "exclusive" religion:
"Jesus said to him, “I am the way, and the truth, and the life. No one comes to the Father except through me." (John 14:16).
It is a core doctrine of Christianity that there is exactly one path to righteousness, which is through acknowledgement of personal sin and personal inability to pay the penalty for said sin, acceptance of the payment offered by Jesus Christ as the only way to pay that penalty, and submission to the Christian God as the only divine sovereign God.
Bhuddism is, from what I understand, a pluralistic religion, where there are many paths to enlightenment, and where many of those paths involve seeking something from within ones' self.
These are at odds as much as two signs saying "there is exactly one door to this room" and "there are many doors to this room".