Pseudonym or No?

So when do you write with a pseudonym, and if so, how do you keep it up?

I'm wondering because I have written a short historical Christian fiction piece and I am using the name Ehud Gershom... though a few folks have told me that isn't easy to maintain/market, or keep two identities. But my fantasy trilogy is so full of demons, warlocks, and violence, that it seems a little weird to be writing about Christian virtues while I'm also describing a demonic invasion...

Thoughts, anyone?

Jane Eyre is on Fire

Here is a little blurb from the bizarro piece I'm working on:

He plunged through the wormhole and emerged in a dead-dark night ripped asunder with a thousand gaudy lights. The air rippled with the sounds of carnival barkers, rusted bumper cars slamming and screeching against one another, and screaming inbred children; it was clotted with the sickly smell of fried intestine and powdered sugar. Disoriented, Voltaire stumbled and fell face first into a pit of sawdust. He barely had a second to pull his face from the urine- and vomit-soaked cinder when the reeking steel bucket of the Tilt-a-Whirl cracked the side of his skull and he fell, reeling.