Mercs and minions

Does the amulet stats affect our mercs and minions? For example does an amulet with + damage to demons apply to skeletons, golems, mercenaries etc?

Assuming you are still talking about

Seraph's Hymn, like you posted on the item's page (and I answered you there), the answer's no.

It only affects you.

Minions and mercenary only get bonuses from their own gear/stats (merc), your skill level (minions) and active auras.

It does not. No stats from your gear impact your merc and minions other than, of course, things like auras and +skills.

Sunder charms may be the only other exception; I know that Assassin traps benefit but I'm not sure about Necro minions. I assume yes.