I think it makes you angry because it's so damn disrespectful. Why does anyone assume you're not smart enough or sane enough to have considered the situation and formed your own opinion.

Because saying shut the f*** up and mind you own business is socially unacceptable.

I don't get angry when they try to convert. I get angry by the stupidity they display when I reason with them.

I totally understand I'm currently going through something similar. I get angry and emotional and annoyed. I've even had someone pray because I was annoyed. Honestly I think it has to do with not confronting things about my views on religion and feeling excluded because I'm a questioning Christian and also being told that im nit a true believer. Athiests( Sam Harris) hardly ever get emotional with religious people, in fact they laugh.
It's as if what ever anyone religious says doesn't affect them and there is no fear of being persuaded.

You belief system is your own personal private business. It is guaranteed by the 1st Amendment. I do not discuss religion. I am not must into dogma, although I will look things up in the Bible. It is an old book and it has history. They quit trying to convert me years ago. My family are bible banging evangelists. I am nothing like them. I think they got the wrong baby.People ask me about why I don't go to church, I tell them I go all the time. Every time I step Out Side I see God's perfection everywhere and I know I am in church.I would just tell them you have your choice of belief and I have mine. All paths lead to God. Not open to discussion.

I think the religious people feel the same way as atheists do on this subject. I was able to be open-minded and see it fron a different perspective.

To me it's a sales pitch and I handle it like any other sales pitch...No, thanks.

It no longer angers me, it disappoints me.. I like to think everyone I meet is a potential friend, if our meeting is viewed by them as nothing more than an opportunity to bring me onboard their ark of the imagination, I’m saddened.

Because I know things that the person trying to convert me doesn't and if they did have that information, they wouldn't be trying to convert me.

It doesn't anger me as much as dissapoint. When a dellusional fool tries to convince me to discard rationality, discard the concept of understanding based on demontrable fact and testable evidence, discard logic, discard questioning thought, and replace all that with blind, unquestioning belief, then the response is sorrow and profound pity for that individual.

In effect, 'How the HELL could your beliefs and fairytales be better than what I already have? A questioning, rational mind?'

You feel anger because the person is failing to show respect for you and your beliefs -- as well as for your right to believe what you wish,.

Count to 10.. walk away...
Just walk away...

For me, because it (intentionally or otherwise) carries implications that I'm not strong in my convictions, that my convictions arent well thought-out, ..essentially that I'm weak-minded. I find it incredibly disrespectful.

The Force has no effect on my mind. Many Jedi have tried.

they want to validate their own beliefs by converting you to theirs and/or their religion makes them feel good and they want you to feel 'that type of good' too.

It doesn’t make me angry. I have an old friend who went Pentecostal...the speakin’ in tongues, rollin’ on the floor, gettin’ a healing type. Whenever we had a slow day in at work, he would stop by my office and try to sell me on his brand of religion. I would usually just quietly listen to his pitch and then politely tell him I simply lacked faith. From time to time he would asked if was cool to discuss church, Jesus, Bible...etc...I told him sure, ...didn’t want him to be a sinner (in his own mind) and not try to sell it. He would cringe whenever I referred to it as “selling his brand of Jesus”.... Whenever he was having a bad time, I would tell him to “talk to the pastor or that Jesus guy...that’s what you pay your dues for”. Then sit and listen to his woes anyway. Afterwards, I’d get a hug and a “Thank you, Brother.”....and no, I still won’t come to your church. ?

Most readers have probably seen this, but I can't help repeating it here for this particular subject:
Religion is like a penis. It's a perfectly fine thing for one to have and take pride in, but when one takes it out and waves it in my face we are going to have a problem.

Becaus some believers honestly think I'm the one with the problem, not them. Like, I'm fucked up because I don't acquiesce to a figment of their imagination....foh....

It’s very hard to argue with the religious idiots as they just get mad. Probably best to just ignore them.

I don't really get angry. I really feel sorry for them. I mean to put your entire life, life style and the way you live over the template of a lie is bad. I guess it depends on how you are perceiving them.

Unless they persist, I get over it.
Otherwise I feel it's an invasion of privacy

I thought you answered your own question well.

it does not anger me I just changed the subject and talk about something else. Can go on with my own private thoughts about the situation. it's important to keep peace with coworkers most I might tell them is I believe in the theory of evolution and leave it go at that.