Both are effective, shocking, memorable. Both work on the same principle: putting "opposites" together -- Bush and a pacifist song, Christianism and a symbol of civil liberties. But both have the same problem. They suppress any possibility of dialogue and argumentation, because they suppress that interval between "opposites": and I put "opposites" between quotes because Bush is much more complex than an anti-pacifist, and Christianism is much more complex than an anti-liberty ideology. Actually, reducing Bush to an anti-pacifist and Christians to supporters of theocracy is so caricatural is becomes ridiculous and plain false.
So those images are also manipulations. Effective and well-done manipulations, but not so far from propaganda. With the context, you can tell that the song is anti-Bush, and that the statue is pro-Christian. But put the very same statue in some museum of modern art and it becomes anti-Christian. Quoting 1984 again, war is peace, slavery is freedom: when the opposites are joined there is not place left for thought.
And that's why in the end I don't like those images.