In the marriage certificate there are two different dates, the date of the religious marriage that took place via video and the date on which this marriage was given legitimacy, in which my wife and I were present. Another different date, and before I submitted the application, a legal lawyer in Canada was consulted and he told me to explain on a paper the method of marriage that took place and took place. I actually explained it before and submitted it in the basic file, and on this basis the application was submitted.
I will express with more doubt than others, this is a legal question of what constitutes a valid civil marriage in Lebanon. And the answer could be that the religious marriage on its own IS a valid marriage and the registration is only a civil registration procedure. Canada would say that this is therefore a proxy marriage (if that's the case).
Or the answer could be that the 'registration' is actually what constitutes the civil marriage. This would be the case, conceivably, if done in just a religious ceremony (incl by proxy) and then a civil ceremony held separately (physically present).
But we cannot say that this is how it might work in Canada can apply elsewhere. In some countries, religious ceremonies are not just statutory but actually required (depending on the faith of the participants). Given the history of Lebanon and religious ... complications there, I simply couldn't say. Your lawyer in Canada probably doesn't know either although has told you how to put forth a non-legal argument (basically, it seems to me, asking IRCC to give you a break, although in a nice way). It's possible IRCC might use the generous interpretation; seems to me more likely they won't, but only a guess.
Better would be if you have ever lived together in the years you have known each other, if ever for more than 12 months continuous, they could accept it's a common law relationship.
Failing that, you could do what others have done (links provided elsewhere).