Speaking of Jesus the bible says;
Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved.”
Acts 4:12 (NIV)
Jesus also said;
Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me.
John 14:6 (NIV)
With the above statement Jesus was saying that He was the only way to God.
Jesus is obviously the way to God or a phoney of some kind. A person needs to test His claims and examine the records of His death and resurrection and come to their own decision.
If Jesus is the only way to God then by implication other people and religions cannot be.