Maybe spend some time thinking about the rituals that go on in this temple. Do all of the participants stand the entire time? If not, some benches or pews would be an appropriate addition. If there's some kind of burnt sacrifice going on, then you'll want some kind of preparation area and implements for it. If it's a live animal to be burnt, then there might be a cage. If it's customarily a humanoid captive, then there could be fetters attached to a wall. There will probably be a table.

Of course, since you've posted this in the VTT section, maybe you'll want many of those things to be tokens instead of being baked into the map.

You might also have some kind of religious symbol on the floor. It could be painted on or formed from differently-colored tiles.