Hi tonyw. I knew you would have a go! I have made some changes because this may be better grammatically. (sorry).
There are only 5 letters used.
'I know 53124 where some 45231 the 413524 from the 5311245 church, then 4211 them. I hope they do not 45231 ours!'
Does this help to find out what 12345 is?