[wideawake]

It was your own argument that was based on the fallacy of the excluded middle

Not at all.

A people that reproduces at or above replacement rate continues to exist and a people that reproduces below replacement rate eventually ceases to exist.

Either a people replaces itself or it fails to.

[steve-b]

Sorry; I see your memory is failing.

Your original argument, verbatim:

There is no practical difference between using contraception and converting to Islam.

You can look it up -- either upthread, or looking for it as an example in a logic textbook under "Fallacy Of The Excluded Middle".