> someone who found religion worth studying
Like it or not, religion has been a cornerstone of history and civilization for about as long as there has been history or civilization. Secularism is a relatively recent invention, and secularism's influence has only been really felt in the last 50 years or so.
Religion is history, and history is definitely worthwhile to study.
Related: you want to face the other person's central viewpoint in its strongest form ("strongest" in the sense of being the best or most compelling variant, not necessarily the variant which has the most supporters or the most vocal supporters.) This is in both sides' best interest, provided both are honest in their motivations.
If someone believes something that's not true, but you only "take down" a misrepresentation of their false belief, you haven't actually helped them, because they know you didn't answer their actual position. It may even strengthen their false belief, because they now have the experience of someone claiming to be able to criticize their position but failing to do so, which they may generalize to "critics of this position have no real argument".
And if someone believes something that is true, but you are able to show a misrepresentation or a weaker formulation of it is false, you haven't done yourself any good. You've missed an opportunity to learn something true, by distracting yourself with a superficially similar position that you can dismiss.
That's a dangerous statement to make. Yes, religion has been hugely influential across societies. But religion has been equally succesful in rewriting history to suit its narrative.
I suspect religion has destroyed as much history as it has informed.
>I thought that was a nice idea.
Its a truly terrible idea, and not surprising that it stems from someone who found religion worth studying. There is no need to delve into the depths of minutia to dismiss baseless arguments. If you argue that Spiderman is real, and he lives at the Justice League, I don't need to study canon of Marvel comics in order to deal with your argument.