Hello and Welcome,
The most likely is dues to S2 Cells…
https://community.wayfarer.nianticlabs.com/t/why-an-accepted-wayspot-may-not-be-used-in-pokemon-go-s2-cells-and-pokemon-go
If you can post the co-ordinates (shown on the 1st email you receive when you nominate) we can confirm.
Good Luck.
I have managed to find it can confirm that it does share a cell so would not be able to become either a Pokestop or Gym.
IMO: It should not have been accepted. As the sign itself does not meet criteria it should only be used as a “proxy / anchor” for the church which already has a waypoint.
It share a box with the church wayspot which is a pokestop.
Unfortunately this means that it won’t appear as a pokestop as it doesn’t meet the games selection rules.