summation of abjad values of the first verses of all Suras
What's the significance of it being a summation rather than, say, a product? Or a division? Or any other mathematical operation?
What's the significance of it being the abjad values rather than some other function of the character position?
What's the significance of the first verses of all Suras? Why not the second verses? Or the last versus? Or just the first character? Or the last character?
The answer is: there is nothing special about any of these operations a priori.
which coincide with numerals of 2 times Golden Ratio minus 1
What's significant about this particular number? I mean, there's an infinite number of mathematically significant numbers. For instance, you can write any sequence of numbers and one could find some multiple of pi that matches it.
The broader point is: if you're looking for any arbitrary rule that maps words to numbers, and any arbitrary rule that maps that number to something that appears mathematically significant, then every book will be full of an infinite number of such coincidences, so your hunch that "the odds seem to be one in a million" is baseless.