Stealing the Silvanus Idol done easilly

[Moonbane]

The vigilance of the druids goes way down after youve exposed Kagha, and they will stop chanting for the Rite of Thorns. Which is when you should attempt to steal it. Note, if you try stealing it while the rite is in progress, they will start combat if trying to nab it.

The idol is in a quite exposed spot in the middle that doesnt allow for a stealth approach. so pop an invisibility potion before stealing the idol to avoid the dialogue when trying to take it. You will likely be intercepted by a guard, but a dialogue check success will get them off your tail, and you can go right to Mol with it for the Ring of Protection +1 reward.

[steelcoresoviet]

For an even simpler approach, use Laezel and her mage hand.

[Angel]

just walk up to it cast fog on yourself take it and teleport out, it's that easy