Criticizing the results of capitalism makes one its father..? Oh, I haven't studied computational linguistics; best to get that out of the way as well. N-grams aside, I hope you can see the folly of making Marx the father of capitalism. In fact it's pointless, useless and fruitless to try and make anyone the exclusive father, founder, inventor or whatever of capitalism; like I said before, opinions will differ. Now personally I think Marx did have a good definition of capitalism and together with Engels proved that it's just another iteration of the class struggle that started in the Neolithic age, right after we were able to produce more than we need to survive. Only with the advent of surplus production the hoarding of surplus wealth and concentration of surplus power became a reality, a reality we've stuck with ever since. But that's another discussion.

The fact that Marx defined capitalism explains why both capitalism and anti-capitalism leads society to ruin.

Explanation needed. Anti-anything is a definition for nothing. What's certain though is that capitalism will end someday. The only question is if that next thing will be yet another variant of hoarding. Kings, Emperors, Lords and Capitalists are all the same in that they all have immense power based on their material wealth. Socialism is nothing more than extending democracy into the realm of the material. That's my version of anti-capitalism. And if that leads society to ruin, well, at least we'll have done that democratically.