The funny part being that they write it as if the ideas are preposterous. Putting religion at the very basis of the operation of the universe is one hell of a drug.
EDIT: Already made it a comment, but I feel it's important before people get that idea that these people are necessarily our enemies.
People write/read takes like this and come to radically different conclusions due to their different base axioms of human experience. For the target readership of catholicculture.org, they are ones that are trying to understand the universe, with the base assumption being the existence of a Christian god. Many an apologetic has attempted to synthesize the real observable world with a just, righteous god. Regardless of their flawed logics, they are at least interested in taking a holistic approach to the human experience rather than an individual, capitalist, exploitative experience. As someone who as a child dove into the catholic theological worldview, desperate for meaning in this clearly meaning deprived society, these people can be radicalized, and are capable of changing their basis of thought. It takes real effort and patience, but they are much more likely to be a devoted comrade to the human liberatory unification experience than a bourgeois hedonistic individualist, who only cares for themselves and the people closest to them, who would rather not ponder their experience let alone the collective human experience, but rather live their own lives in pursuit of illusory happiness in isolation.
The question of a larger reality above ours, from a physicists perspective, is unknowable and somewhat misleading when some of the more out-there pop-physicists speculate.
Really, we will never know the exact nature of the cause of the universe's existence, to believe that we can somehow look past the genesis point of time's very existence is indeed idealist. However it also results from a misunderstanding of the nature of our own reality. Our perceptions are already proven by physics to be limited by our positions and relative velocity in spacetime, and at the level of particle physics, we are at the very boundary of test-ability; theorized particles of a smaller scale than those observed thus far would require more energy than all of that in our solar system.
There are certainly things unknown to the sciences of today, and there are certainly things that are unknowable. But what we do know is that the universe is material, consistent, and testable. To dispute this is to dispute materialism itself, without which we can have no Marxism.