Well... I couldn't manage the fighter of my dreams so I instead made a cleric with less intelligence than a brick. I'm not entirely sure if I did this right so please point out any and all errors with Doctor Sub-Brick. I've put him down as "Chaotic Evil" though I choose to interpret it more along the lines of "Barely more than an animal so just kinda operates off that". If that's a problem I can change it.
WIS bonus spells for Clerics give you whatever is on your WIS score and everything below it. So an 18 WIS gets an extra 2 1st, 2 2nd, 1 3rd, and 1 4th. In your case, you'd get the bonus spells for 13 WIS and 14 WIS, so you get two bonus 1st.
Dunno how Rem is gonna DM alignment: the old "you wouldn't do that because you're CE" or "you're doing too much stuff that isn't CE, here's your new alignment, also changing alignment comes with penalties", or just "act CE and you become CE, the main penalty being loss of henchmen and intelligent magic items that won't work for you anymore".
If your character is gonna be selfish and skeezy and willing to hurt others to get what he wants for himself, CE would be a good choice. But if he's just random or flighty, that's probably CN. If he's really just too dumb to philosophize and is easily controllable by strong personalities, "animal-like" as you described, acting more on instinct than thought, N or CN would probably be good.
How about this: what does he do when he finds something he doesn't understand? What about when he has power over someone vulnerable? If his first instinct is to smash and oppress, evil or chaotic would make sense. If he would investigate or help, lawful or good would make sense.
I think stupid-evil as CE or NE works though. You don't have to be smart to be a jerk.
I guess you could do any alignment with an animalistically-stupid character depending on how you roleplayed it.