I would agree with this ONLY in the case of very extreme Christians who are 'in your face' about it. But then again, I'd say a lot of very extreme/militant atheists are just as annoying.
Leaving it just as Christianity in general thought seems rather broad.
“Everybody has a secret world inside of them. All of the people of the world, I mean everybody. No matter how dull and boring they are on the outside, inside
them they've all got unimaginable, magnificent, wonderful, stupid, amazing worlds. Not just one world. Hundreds of them. Thousands maybe.” -Neil Gaiman
I have some non-mainstream belief systems that came from reading books. Some of them have cult-like attitudes that I used to share, and it took me a while to mellow out somewhat.
Objectivists (fans of Ayn Rand's books): These people say everything you do, think, and feel is irrational, and irrational is bad. Only Ayn Rand is rational.
Libertarians (political party also associated with Ayn Rand): There was a joke about libertarians that I really liked. How many libertarians does it take to screw in a light bulb? None - the free market will take care of it. This is a legitimate grievance about how some libertarians, not all of them, avoid thinking too much about how some problem would be solved. (I tend to agree with 'the free market will take care of it,' but I understand that this isn't enough of an answer.)
I'm still an objectivist/libertarian/anarchist but I am aware of the cult-like mentality in those groups, and they can be annoying.