Jesus said to him, "I am the way, and the truth, and the life; no one comes to the Father, but through Me. (John 14:6)
This statement alone reveals that all other religions and religious ideas cannot be true. No religion other than Christianity claims that Jesus is the only way to God. Therefore, either Jesus was telling the truth and He is the only way to God or He was a liar and Christianity is false.
Evangelical Christians, in their zeal to follow the commands of their Lord, may seem to be over-enthusiastic and judgmental. However, in believing that Jesus is the only way to God, we want everybody we meet to understand their choices and the consequences of those choices. Love requires that we share the message of the gospel (good news) of Jesus Christ. The good news is that all people can enter into a personal relationship with the God and Creator of the universe through belief in Jesus Christ.
"For God so loved the world, that He gave His only begotten Son, that whoever believes in Him should not perish, but have eternal life." (John 3:16, Jesus Christ)