I assume you're talking to yourself, because you're the only one who brought up the angle of Christians not voting for Lieberman because he's Jewish. Please keep us updated on this running dialogue you're having with yourself.
Lieberman would be a puzzling choice, he's pro-abortion and more significantly, he's a Democrat, that's enough to turn off a substantial number of Republicans, Christian or not.
I'd vote for McCain/Lieberman, although with strong reservations, McCain/Romney would be a much better ticket.