I think there's a misunderstanding with the way you are understanding my message. I wouldn't ever go around telling random people whether they're gay, religious, atheist, or otherwise, my views on sensitive matters. That would be intrusive and disrespectful.
What I mean is that in a relationship of trust, if the subject naturally comes up, I would share my perspective respectfully, without imposing it. Just as you have the right to express your beliefs or lack of belief, I also have the right to express mine but always in a way that respects the other person's freedom.
So my point is not about warning or teaching strangers, but about honest dialogue when there's mutual openness within the right situation.
Hopefully that clears out the misunderstanding