Membership in the Catholic Church is the only way to go to Heaven. There is only one way to go to Heaven.

Just thinking of God is enough to bring the Light and take a soul upward. As the popes have taught, there are many ways to God but Catholicism is the discipline of safest and quickest entry (because, in that discipline, is the narrow gate).-Spirit Daily
http://spiritdaily.org/blog/afterlife/the-most-direct-entry-into-heaven

Membership in the Catholic Church is the only way to go to Heaven. There is only one way to go to Heaven. This is what the popes before Pope Pius XII taught.L.A