Believing the earth is a globe is not, however, a modern idea. It was the scientific consensus of Catholics throughout the middle ages. Of course, I see nothing strange about traditional Catholics continuing to think this.
When one thinks about how old the Church is, and how old the ancient Hebrew cosmology was (based on Scripture), then yes, a ball earth is a modern idea. IMO.
If you want to believe that the earth is a ball, that's fine. But some of us do not. You've never been able to prove that all Catholics believed in a ball earth through the middle ages. Some of the universities taught this, but so what. That doesn't make it true.