Is Jesus the only way to God - what about other religions ?           
                                                                           
Sincerity does not equal truth. People can be sincerely wrong. If the different religions contradict each other (which they do at several major points) they cannot all be right. The question really is : Has God revealed Himself, and if so, how ? Jesus claimed to be the unique revelation of God. He claimed to be God in the flesh. Are His claims valid ? See WHO IS JESUS, and also investigate the New Testament. If He is God the other religions are wrong.

Jesus claimed he was the only way to God (John 14:6).