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I have always wondered why Calvin started with 'THE KNOWLEDGE OF GOD THE CREATOR" - whereas the Westminster Confession begins with 'Of Scripture'.

You could read what the Confession says as to why it begins with Scripture:

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Although the light of nature, and the works of creation and providence do so far manifest the goodness, wisdom, and power of God, as to leave men unexcusable; yet are they not sufficient to give that knowledge of God, and of his will, which is necessary unto salvation. Therefore it pleased the Lord, at sundry times, and in divers manners, to reveal himself, and to declare that his will unto his church; and afterwards, for the better preserving and propagating of the truth, and for the more sure establishment and comfort of the church against the corruption of the flesh, and the malice of Satan and of the world, to commit the same wholly unto writing: which maketh the Holy Scripture to be most necessary; those former ways of God's revealing his will unto his people being now ceased.

Not surprisingly, Calvin says much the same in Book I, ch. 6:

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Therefore, though the effulgence which is presented to every eye, both in the heavens and on the earth, leaves the ingratitude of man without excuse, since God, in order to bring the whole human race under the same condemnation, holds forth to all, without exception, a mirror of his Deity in his works, another and better help must be given to guide us properly to God as a Creator. Not in vain, therefore, has he added the light of his Word in order that he might make himself known unto salvation, and bestowed the privilege on those whom he was pleased to bring into nearer and more familiar relation to himself.

Kyle

I tell you, this man went down to his house justified.