They do exist. They do change their minds! I might have been there once.
If someone claimed the same thing, well, that wouldn't be strange. However consider this..
The God of my religion is The Ultimate Reality. Is there any God greater? Nothing else is even worthy of being called God.
Loving this God over all things necessitates the abandoning of idols. The cleaning of the Nous.
Loving God with all your heart, soul, mind, and strength. The first commandment and greatest commandment.
And the second is like it. Love thy neighbor as thyself. Where does that come from? Recognizing that we were created in the image of God. To love others is to love God.
If you love God, you love yourself, an image of God. You show this love for God and God's image by cleaning the image of what defiles it. You love others because they are also images of God. They might be distorted or tarnished by sin, but they are still images of God. Make sense?
And so it isn't simply a self absorbed "love of the truth". Quite the contrary, loving others comes from loving the truth.
Because the Christian should strive to be a living Icon of Christ, who told us to love others as he loved us. And Christ loved us so much as to show us how to partake in the divine nature throuhh our union with him.
Live The Truth, that is The Way, that is The Life.
And what purer religion is this? For we take care of orphans, widows, the poor, and love those around us without being pietists. The works themselves are not the faith, and indeed such a faith is empty. We do these things because we love God, who is sure and eternal.
Who could have a problem with this religion? Who could say it was a bad thing? To those who work to move people away from this good faith, it would be better if they were dead. And we don't pray for their death, we pray that they repent from their wickedness and come to The Truth.