My non-lawyerly understanding of the situation in the US, at least, is that if they trademarked God War, they might be able to stop you using God Wars, which would be a fairly clear infringement on their trademark. I don't think you'd be able to file for a trademark because afaik God Wars is non-commercial, and trademarks may only be obtained in relation to commercial activity. I wonder if you could stick a few google ads on your site though and claim that God Wars 2 is a commercial enterprise, then register for a trademark? I have no idea.
A quick US trademark search shows that God of War is a registered trademark (by Sony) but God War and God Wars is not. I bet there's a decent chance that trying to trademark "Gods War" or "God Wars" as a game-related trademark would be rejected, in which case you've got nothing to worry about since if Sony was going to come after you for GodWars I'd imagine they'd have done it by now.
--matt
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