1 Corinthians 2:15 But he that is spiritual judgeth all things
1 John 4:1 ¶Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
Why does it upset you so that someone has a different religion than you do?
It doesn't upset me at all other than the fact that the unbelievers in the true Jesus Christ are going to Hell. In fact, I fully support their rights to chose Hell, though it pains me. Just like I fully support my right to speak out about false religions.
The same laws that allow them to believe in false Christ' allow me to speak out about that.
That's a good one to carry with you always...
:)