Er, love and christianism symbosl are not a particular meaning, they are universal meaning related to function of Myshkin as a Martym (you even say in the post about a world view). Still a particular (some prince in a moderm - of course moderm in relation to first century - world) meaning universal symbolisms. Dostoievisky is not an allegorist. An Allegory of Eternal would be Borges's Alleph or Kafka's Castle.
The Demons is for example, closer to an allegory, but even so...
