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straw said:

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

That is easy. Calvin was bascially writing a systematic theology (though not in the developed form later ones would take I think). In systematic theology, each doctrine is built upon the last (and pardon me if I am telling you something you already know) in order to complete a logical and coherent system. Thus, the building of a clear set of doctrines and principles must begin with God. Before we can understand anything else, we must have an idea of who and what God is. The WCF is simply a creedal statement, not an in-depth theological treatise. It was created to clarify and express a set of commonly held beliefs, as well as provide a reference point for matters of dispute and debate. They are completely different documents with completely different purposes. Hence, there is no great surprise to see that they differ in topical order. I wouldn;t read too much into that comparison were I you.