Say what you will about CS Lewis, but Aslan's whole "it doesn't matter who you believe in, so long as you do good" deal is what a benevolent deity should be.
Fair point about Susan, but the dwarves literally chose not to step through the door into the light as the world was ending around them. It might be that they did have ideological reasons to reject Aslan, in the same way that an atheist at the gates of heaven might cite aspects of the abramic faiths as reason to not enter, but IIRC the narrative doesn't give any indication of that.