By class definitions, clerics worship a single deity....no more, no less.
Clerics can be respectful of other deities, especially those who are Allied or Friendly to his or her own deity, but as far as worshiping goes, no.
The Layonara deities have a very complex series of relationships. As a cleric/priest/priestess of a particular deity, your RP should not only reflect the dogma of that particular deity but also the relationship between one's own deity and that of other characters in the game.
Example: While not necessarily being overtly hostile, a Lucindite cleric and a Toranite cleric may find each other at odds regarding differences of dogma, they may be reluctant to heal and/or raise each other, etc. While such differing faiths may be within their reasons to join together for some common goal that benefits both philosophies, there should at the very least be some degree of animosity between the two faiths....especially among the clergy and paladins of those faiths, if applicable.