Well, for starters, I am certain the DMs have access to a spreadsheet for each character, and obviously deity as well.
Details like top-ten donaters overall, top-ten donaters per deity, the donation amounts that a certain character has made to all deities, how many items donated, and of course, the total gold ranking of the deities that everyone can see on the donations page. DMs have it all already.
As for the exact list of items, I do not know..
And for what purpose all that money will do, come up with some ideas/projects/events that the church might be willing to spend that kinda money on. They could take it right out of the bank account.