The Casimir effect arises because of vacuum state energy which is indeed the focus of this article. You are mistaken and the original poster is correct. Since this is quite well established, I’ll expect a citation as a rebuttal (and not from a religious website.)
If something exists, the question of whether quantum mechanics could have created the something from a nothing is just the sort of arrogant question haters of religion think represent their intellect.
What causes the Casimir effect? The proximity of the plates being charged excludes certain wave lengths which in turn 'push' upon the outer surfaces of the plates?
For there to be wavelengths, time must exist. Before the 'bang' time nor space exited. Time and Space were made to exist, then events started occurring and things started to exist, even your arrogant self.