One God, not many. People of other religions need to understand that simple fact. It parallels Egypt and the Neteru. The ancient ones.All Hindu deities are themselves symbols of the abstract Absolute, and point to a particular aspect of the Brahman.
Actually, some unconciously acknowledge the aspects in their own religion, while refuting the validity in others. The Holy Spirit for example, has appeared in several forms, of which the dove, and tongues of fire are well known. God appeared as a burning bush.....
http://hinduism.about.com/od/artculture/a/symbolism_of_deities.htm