This is the type of religious propaganda that would appear in a worksheet for children in a Catholic school. It doesn't belong here. There are no arguments here, just the presupposition of some deity.
This isn't "propaganda", it's attempting to give a casual look at Aquinas' philosophy (which, as the author points out, does not presuppose a deity). Moreover, if you read the rest of the site, you will see that this author tries to give this sort of casual look at many diverse philosophical ideas (not just religious philosophy or Western philosophy). You are having a knee jerk reaction to a strawman, not responding to the actual substance of the article.
The arguments are simplified, but they are there. There's a lot to it beyond "God exists because I say so", especially if you dig deeper. I think they are valuable even if you dont believe in the existince of a Christian God.