Simple RAW thread for 3.5 #31. By now, your question has probably been answered.

[Andezzar]

A 58

No, not being able to cast spells of an opposing alignment is a feature of the cleric class. If you are not casting as a cleric, you do not have that feature. SLAs are cast as if they were Sorcerer/Wizard spells.

Some spell-like abilities duplicate spells that work differently when cast by characters of different classes. A monster’s spell-like abilities are presumed to be the sorcerer/wizard versions. If the spell in question is not a sorcerer/wizard spell, then default to cleric, druid, bard, paladin, and ranger, in that order.