"Whereas Canada is founded upon principles that recognize the supremacy of God and the rule of law:"
And lest someone counter by saying that "Whereas" here means "In spite of the fact" or "In contradistinction to", Merriam-Webster's dictionary mentions a second meaning: "in view of the fact that: Since- used especially to introduce a preamble."
The hermeneutical key for the preamble of our very own consititution is the supremacy of God and the rule of law. No more, no less. It follows that any subsequent interpretation of this document that violates said recognition is a false interpretation. And since any proposed recognition of homosexual marriages is a clear failure to recognize God's supremacy (note that the word supreme contains within its denotation the possession of authority and dominion), it follows that the legalization of gay marriages in Canada is un-constitutional and unlawful.