There's a non-trivial chance that I'll be teaching an introductory philosophy of religion course for the first time this up and coming semester. When I took the class with Robert Koons when I was an undergraduate we mostly used Mackie's The Miracle of Theism. It was pretty good, but I'm sure that better books must have come out in the ensuing twenty or so years. If anyone has any suggestions, or knows of any discussions that might be helpful, that would be aces.
Justin Weinberg hosted a pretty interesting discussion about the state of the field over at the Daily Nous (here) about whether philosophy of religion should be taught in the first place. The consensus of the people against it seemed to be some combination of: (a) most philosophy of religion is Christian apologetics in disguise, and (b) Christianity is so antecedently stupid that it is malpractice to take it seriously (cf. philosophy of telepathy).
I don't think Christianity is antecedently stupid, and I think the first isn't a complaint about philosophy of religion per se, but rather a broader complaint about the lack of engagement with non-Western philosophy in Western departments. I am, however, concerned that books like Mackie focus so much on the question of whether or not God exists. As has been discussed by Helen De Cruz multiple times here, it's very weird to filter all philosophically interesting questions through this one lens and also possibly involves systematically misconstruing religious practice. It would be nice to be able to focus at least as much on broader epistemological and ethical/socio-political questions (as well as metaphysical and meta-metaphysical questions beyond the simple "does x exist?" kind) arising from philosophical reflection on religion. But that might be a bit much to ask for in an intro class. Anyhow, if anyone has any suggestions for syllabi or textbooks, that would be gravy.