One might have supposed that the use of ‘Olympus’ for ‘Heaven” would be limited to Renaissance Italy, like the story of the churchman who kept a votive lamp perpetually burning before a bust of Plato. But no, there it is in Paul the Deacon’s 8th Century hymn to St John the Baptist:-

Nuntius celso veniens Olympo/ Te patri magnum fore nasciturum,/Nomen et vitae seriem gerendae/Ordine promit (A messenger coming from high heaven discloses in due order to thy father that thou wouldst be born great, thy name, and the course of life thou wouldst lead)

Personally, I don’t object to it, as a nod to the idea that whatever is beautiful or well-founded in pagan mythology and aspiration is fulfilled in Christianity. But the use of ‘Jove’ for God or even ‘Diana’ for the Blessed Virgin, both of which apparently happened on occasion, is clearly beyond the pale.