The parties that don't hold much sway always look for wedges.
They are always in a state of campaign. A motion isn't really anything. They are simply playing games.
The usual explanation is that a "phobia" is a disorder so you can't really fight it and that it's perfectly reasonable to fear certain aspects of islam (fundamantalism, sharia, etc.).
But the real reason is mostly opposing for the sake of opposing and trying to make people believer that the Liberals are favoring muslims over the rest of Canadians.
What I figured. I thought there was actually something wrong with wording it as islamaphobia