According to the Pew Forum's research, a majority of all American Christians (52%) think that at least some non-Christian faiths can lead to eternal life. Indeed, among Christians who believe many religions can lead to eternal life, 80% name at least one non-Christian faith that can do so.
You can read the full report here.
Jesus said to him, "I am the way, the truth, and the life. No one comes to the Father except through Me." (John 14:6)
What do you believe? How real is your faith to you?