The left has succeeded in the way you mention for one reason: because they give away objects of material value for free.
And when we won with our show of force it was because we had moral justification for fighting.
Without a transcendent basis for our rights, these rights don’t really exist. They’re only opinions.
Even with you claiming a transcendent basis, they are only opinions. It took humans almost 1800 years after Christ to come to the sudden conclusion that God wanted humans to have any rights at all. The Bible never mentioned them. The Catholic church didn’t seem to notice them. Then, suddenly, in America, in the late 1770s, someone decided they were “self-evident.” Oddly enough, they hadn’t been self-evident from Adam to Abraham to Aristotle to Aquinas. It took Adams et all to suddenly decide that God wanted us to have the right to privacy and a free press.