Since When Does Canada Recognize the Supremacy of God?

While reading Canada's Charter of Rights and Freedoms, which came into effect in April 1982, I was dumbfounded to find this stupid sentence in the preamble:

Whereas Canada is founded upon principles that recognize the supremacy of God and the rule of law.

Since when? The Constitution Act of 1867 never even mentions the word 'God' and there is nothing in the entire document that even alludes to this supremacy. So, what I want to know is who found it necessary to include such a retarded statement in the Charter where freedom of religion is guaranteed as a "fundamental freedom." Or does freedom of religion only mean freedom to practise any religion and not freedom from religion or religious belief? This statement is ludicrous and I guess it doesn't really make a fucking difference anyway but still, I want to know who came up with this and why it was included in the Charter in the first place. I guess I'll have to do some digging.