The correct phrase, I assume you meant, is: Correlation does not imply causation. Since this is correct term used in the disciplines of Mathematics and Statistics regarding cause and effect. Let us use this good statement you have brought to our attention.
‘Imply’ means: to involve or indicate by inference, association, or necessary consequence rather than by direct statement, thus in study of Logic, would make the statement ‘Correlation does not imply causation’ correct in some cases, and thus by Logic, is incorrect in other cases.
In any event, this is the archaic methodology. This statement has been under review for years now and is not a maxim as you have suggested. That is why the preferred statement is:‘Correlation does not necessarily imply causation’. In summation, the use of the statement, by logic, does not support your comments.
And by the Logic above I reiterate:
The Novus Ordo IS IN DECLINE, as much as you and I would like it not to be. I am very pleased that the diocese you are contained within present with full churches (hopefully during Mass). However, unfortunately this phenomena is not the status quo. BTW, You are correct, declination may be used as you stated as a Magnetic Declination. Where YOU ARE INCORRECT is your perception of the usage of this word in my post. There are approximately 7 Definitions (one of which is the one you are aware of). It is a common mistake by many, but the word IS utilized correctly (consult the Oxford Dictionary). I am sure your intentions were good and Christian in nature and in not to belittle a fellow Catholic. Thank you for your response.