I'd have to say yes and no. If her beliefs are benign, like most Christians' beliefs are, then no I could care less and I'm sure those are the kinds of beliefs the Canadians don't mind. If she ruminates on daft Christian eschatological claims and believes that our foreign policy is playing some part in bringing these claims to fruition, then they do matter to me; I'm sure the Canadians would care if Mr. Harper or some MP started saying things like she does. I could care less if she goes to church every Sunday, prays to Jesus, and the various things that most mainstream Christians do and discuss publicly. However, her religious views go farther than that. If someone believes Christ will soon return, that some apocalyptic conflict will come with his return, and they're happy for it, then that is inseparable from politics. Like I said it doesn't have to outright deter her constituents from voting for her, but it isn't a topic that's off limits when it comes to discussion.
In other words, if there were two Michele Bachmanns running for reelection on the same platform, except one of them believed in the end times business and the other one didn't, then voters like myself would be inclined to vote for the one that didn't believe in the end times business.