Greater Spell Penetration( Deities and Demigods, p. 50)
The deity's spells are especially potent, defeating spell resistance more readily than normal.
Spell Penetration (PH) ,
The deity gets a +4 bonus on caster level checks (1d20 + caster level) to beat a creature's spell resistance. This bonus overlaps (does not stack with) the bonus from Spell Penetration.