That sucks. Officially, the school introduced a new condition for hiring professors a few years ago, that they must uphold the Judeo-Christian values. At the time I thought it perilously close to being a litmus test on the basis of hiring new professors (and something they could use to keep atheists and/or agnostics out). I was particularly worried about the effect it would have on the science/computer/math departments, whose faculty have a better chance of being foreign-born (and therefore not Christian) than most other departments.
I'd like to say that I'm shocked the policy was used to boot Lewis, but I'm not. The Political Science program (and by association the Ashbrook center) is buttressed by a donor base and "friends" that are overwhelmingly Christian Conservative/Evangelical. At the very least this makes things difficult for anyone remotely associated with objectivist philosophy.
So, yeah. None of my money, either.