Do you have sources for this?
Due to US sanctions against the DPRK, most American/Japanese stuff that SEK Studios worked on was uncredited saved for some animators names. But you can easily find them on the credits of European shows. I think CNN recently reported on how Italian TV stations and studios didn't care about the sanctions and paid fines so they could continue working with SEK Studios.
And specifically, wdym with catholic shows?
Marcelino Pan y Vino (or just Marcelino in Japan) is a catholic animated show made produced by Italy, France, Spain and Japan, though most of the animation was outsourced to Japan and the DPRK (due to sanctions they had to remove the SEK Studios credits from the english version, but you can find them on the Italian, French, Spanish and Portuguese versions). You can easily find most episodes on youtube, and most of them have SEK Studios credited with the animation, specially from season 2 on.