Something is true or it is not true. Logic and science itself depend upon it. I.E. drawing an inference from known facts . . .
Norse/Teutonic cosmology
C. S. Lewis studied Norse lore extensively, and he eventually embraced Christianity. (e.g. his Mere Christianity). (Wasn't he a big time skeptic for a while?) He knew a lot more about the Norse/Teutonic mythology than I do at the moment. However, the Nazis embraced the recurrence notion associated with the swastika, whether the Norse did or not. The reason it was called "the thousand year Reich." They anticipated the cycle of history overtaking the Reich, but wanted to grasp the ring for the Nazi time . . .
The Greeks and Romans left a lot to civilization. It was left to the Christian West to preserve and build upon their achievements in law, philosophy, etc. (Reading a history of Islam: during a time they were open to Europe, they obtained Greek/Roman knowledge from the West). It could be argued that the Greeks/Romans took progress as far as their philosophical worldview would permit. The scientific method, etc., then came from the Christian West . . . (The Vandals and Vikings and other tribes wandering around Europe didn't seem to be particularly interested in preserving Greek/Roman writings?)
LOTS of wacky weirdness
The basis of Catholic thought however is not weird, but rational. There was an encyclical released a couple years ago, I'd butcher the Latin title: Faith and Reason. In a nutshell, faith and reason are compatible. They each lead to one and the same truth . . .
The theory of relativity, for example, gives insight into the understanding of what eternity might be like, timewise . . .
If you happen to be one of 'em then obviously it won't seem silly. But to everone else...
As you suggest, the supposed "weirdness" of Catholicism is not weird when you understand it, using the gift of rational thought . . .