The common rule is all objects are immune to poison and psychic damage:
Objects are immune to poison and psychic damage, but otherwise they can be affected by physical and magical attacks much like creatures.
(Player's Handbook, page 185)
Are there any specific rules (or maybe confirmations from developers), saying that radiant damage affects living beings only? All the respective spells deals radiant damage to creatures explicitly, even when the caster needs to make an attack roll:
A flash of light streaks toward a creature of your choice within range. Make a ranged spell attack against the target. On a hit, the target takes 4d6 radiant damage
or even a weapon attack:
The next time you hit a creature with a melee weapon attack during this spell's duration, your weapon flares with bright light, and the attack deals an extra 3d8 radiant damage to the target.
I've found only two spells that affects "weapon attacks" in common (no creatures mentioned as valid targets):
Your prayer empowers you with divine radiance. Until the spell ends, your weapon attacks deal an extra 1d4 radiant damage on a hit.
While in the aura, each nonhostile creature in the aura (including you) deals an extra 1d4 radiant damage when it hits with a weapon attack.
Is it an inaccuracy in the spells description?
Or can radiant damage actually destroy objects as well?