For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. – John 3:16 (KJV)
It doesn’t matter what the Pope says. It doesn’t matter what Rick Warren says. It doesn’t matter what Muslims, atheists, Buddhists, Hindus, or anyone else says. There is only one path to salvation and the most well-known Bible verse in modern times is pretty darn clear about it.