[He'll have you know refering to his people as the e-word feels terribly insulting. If he ever were to do it out loud offense will be raken.]

God? Eru, I suppose. [He says after some thought.] Though I can't say I'm a terribly devout man. Or that Eru ever have demanded that we worship him in the first place.

[If Maedhros ever made claims of worshiping something like Slaanesh he'd be terribly disappointed in anyone who didn't slit his throat for it. For he'd obviously had his mind taken over by the Shadow then and leaving him alive would be cruelty of the highest ordet.]