I doubt that seriously. The concept that rights only exist if one can defend them has a long philosophical history. "Divinely-endowed" rights were originally used by monarchs to secure their holds upon power. The rest of the population was able to secure only those rights they were willing to defend against said monarchs.
That's a far cry from saying inalienable rights exist because we can defend them. If man is "endowed" with these rights by virtue of a Creator - which is what our forefathers held, wrote out, and defended - then these rights exist apart from our ability to even recognize or defend them.