I believe that you have to accept Jesus Christ as you personal lord and savior to go to heaven, and that is the teaching I follow.
The Jesus says in the bible " I am the way the truth and the life and no man come to the father but by me" now I cant 100% stand by my faith and then accept that there might be another way to heaven. I cant have it both ways. If i agreed that there is another way then i have disagreed with everything my faith is based on.
The Bible also says "every knee shall bow to me, and every tongue shall confess to God."
So one way or the other we will know one day, if I'm right then every knee shall bow and of I'm wrong we just die. I will take my chances with my faith.
So I hope everyone can find this in their lives but I dont judge anyone its not my place to. So everyone can do as they will.
Like someone else said if I'm wrong, I'm wrong.
I think people have a hard time grasping the concept that a loving God would send anyone to an eternity of torment and hell, but I dont believe that God sends anyone to Hell, people have the choice it all depends on what you want to do and what you choose to accept.
At the end of the day my faith is a personal relationship with my Lord and savior, the key word being personal.