I would be quite surprised if Mother Theresa and Pope John Paul II made it to heaven. Certainly by the standards of the world and by the Catholic church they are there.
But, unfortunately for them, those are not the standards by which we are judged. If they did not place their belief in Jesus and were not born again of the Spirit, then they are not in Heaven.
Mother Theresa herself expressed doubts about whether she was saved and going to be with God upon her death. For most of her life she was filled with doubt about her salvation. If one is saved, there will be no doubt since the Holy Spirit comes to live inside us. We have no doubt whatsoever.
http://theworldfrommywindow.blogspot.com/2007/08/sad-truth-about-mother-teresa-revealed.html
I do not believe Mother Teresa was ever born again and filled with the Holy Spirit. If she had been, she would never have doubted her salvation.
ph