I'm sorry, but I don't see that as beautiful. At first it does indeed look like a church window, but when you zoom in, the window is covered in graffiti, bubble writing, a smiley face, random squiggles. What is the significance of the "praying hoodie" with the paint pot? Is he asking for forgiveness for defacing the church window? To me it represents yob culture and a disregard for the sanctity of a church.
Churchyards and cemeteries are often getting vandalised, 'hoodies' are a symbol of today's youths getting up to no good.
Banksy has made millions from his graffiti and from the mystery that is his anonymity. If only we could see our old buildings brought back to their former glory, restoring and reinvigorating our towns and cities, instead of adding to their demise under the guise of a Banksy instalment.
For fans of Banksy, there is always the opportunity to support and admire his work in the form of a painting (poster?) like the one you have in your living room, it is personal choice and that is fine, but please leave public spaces/gable ends/bridges/sea walls clear of graffiti in the guise of artwork, because not everyone is a fan.