Spells per Day

At the indicated levels, a rage prophet gains new spells per day as if he had also gained a level in a divine spellcasting class he belonged to before adding the prestige class. He does not, however, gain other benefits a character of that class would have gained, except for additional spells per day, spells known (if he is a spontaneous caster), and an increased effective level of spellcasting. If he had more than one divine spellcasting class before becoming a rage prophet, he must decide to which class he adds the new level for the purpose of determining spells per day.