How has gay marriage being legal in Canada caused harm to heterosexual marriage in Canada?

I ask sincerely, because many Christians in the USA claim gay marriage being legal there will harm heterosexual marriages. If their claim is true, we should already be experiencing these negative effects since gay marriage has been legal here for some time now. (If this question offends anyone they... show more I ask sincerely, because many Christians in the USA claim gay marriage being legal there will harm heterosexual marriages.

If their claim is true, we should already be experiencing these negative effects since gay marriage has been legal here for some time now.

(If this question offends anyone they shouldn't be on the internet, as I asked this in a way that was incredibly neutral)
Update: @ Julia: Why should I care? I've recently decided to declare myself non-denominational in respect to my former church because I have doctrinal differences that I can't currently resolve.
Update 2: @ Julia: I can't get over this article. So for the time being, with respect for the Catholic church, I'm stepping away because I can't come close to agreeing with the actions taken. http://ncronline.org/news/justice/nun-excommunicated-allowing-abortion I have no desire to join a Protestant... show more @ Julia: I can't get over this article. So for the time being, with respect for the Catholic church, I'm stepping away because I can't come close to agreeing with the actions taken.

http://ncronline.org/news/justice/nun-ex...

I have no desire to join a Protestant denomination, so currently I'm declaring myself non-denominational.
Update 3: @ Julia: No response? Seriously?
Update 4: @ Julia: I know how late it is where you live.

I posted an edit to the question you linked.

Good night.
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