I just answered another thread where they author asked if I thought my religion was the only true one.
The term true is relative when we talk about this. What are you really asking? There's religions similar/spun off from my personal beliefs (I don't call my beliefs a religion, it's just the Bible, which is a book, which is the Word of God, not a religion).
Some of them are very likely... "true." Satanism, for example, performs reverse exorcisms, and follows the fallen rebellion of lucifer and his angels. I believe that satan and his fallen angels are real, so if it is someone's goal to end up away from God and His kingdom, and to avoid His salvation, then they would have it by doing the things that group does.
So that's true, right? I also think many of the minor gods and idols through time were demonic in nature (that is, fallen angels or angels who have sinned and are in rebellion toward God), and those I think are real, so those "religions" are "true" too, I guess?
So what are you asking, really? "Do you think your beliefs are the only way into heaven/afterlife. Do you only "win" with your religion?" Again, if you want everlasting life and to dwell with God, who is the creator of all, for all eternity... then you'd need the salvation of Jesus Christ. You won't get it anywhere else. Is that what you meant by "true"?
If that is not your particular desired outcome however, then pick something else and good luck. Whether you end up where you think you will is not up to me, in liklihood it will be either a lake of fire, a great furnace, outer darkness, or complete destruction. None seems appealing, but alas, if that's what you want... there you go.