The etymology of the words “consummate” and “consume” are completely different. The former is from con (altogether) and summa (sum total; taken from summa (highest supreme)): my interpretation is “union with god”. Which fits with its adjective definition: high degree of skill; complete or perfect. The later, to consume, is from con (altogether) but added to sumere (take up). And if someone were to altogether-take-up I would assume that there would be nothing left.

This is from the verb "to consummate", not the verb "to consume".

TIL that these two words do not mean the same thing.