The Bible answers your question :-)
John 14:6 "Jesus said to him, 'I am the way, and the truth, and the life; no one comes to the Father but through Me.'"
John 3:16 "For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life."
Acts 4:12 "And there is salvation in no one else; for there is no other name under heaven that has been given among men by which we must be saved."
John 3:3 "Jesus answered and said to him, "Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God."
2 Corinthians 5:17 "Therefore if anyone is in Christ, he is a new creature; the old things passed away; behold, new things have come."
Ephesians 2:8-9 "For by grace you have been saved through faith; and that not of yourselves, it is the gift of God; not as a result of works, so that no one may boast."
I have written a hub called, "Come to JESUS: Salvation": http://hubpages.com/religion-philosophy/Come-to-JE