Why so some people of some religions constantly try to convert/impose their beliefs on other people who believe in a religion other than theirs??? I mean-how hard is it to respect others faith? has anyone experienced this??

\*DO (typo error) I have experienced seeing someone from a particular religion try to convert a friend of mine. And every time we sat and talked to that person, they would constantly talk about how "their religion" is the only true one. I find this amusing. Like are they taught to do this? everyone in the world talks about how important it is to respect others opinions, until it comes to religion. Like why can't u just let me believe in my religion? It's really not that hard. I think religion is personal, its not something u force upon others. I don't think people truly realise how uncomfortable it is when they do things like this. Do you guys have any similar experience??