I probably have a second Christian name

[Mortimer]

Svetozar is not a Christian name but pre Christian slavic I remember though that I had a Christian name when I was baptised but I don't remember it anymore I need to ask for a document from the registry of baptism

[TheMaestro]

Your name since today is David, so you could become Jewish later, or remain catholic. You can still check out evangelical church buddy, you will like it.