Heavy on sweepers because mono white doesnt have tons of targeted removal options
If they fit in with your plan, there are a few good 'removal' spells in white:
Ixalan's Binding removes the immediate threat and prevents any other copies from coming down.
Seal away is all star mono white removal, get em after attackers are declared and before damage is assigned.
Luminous Bonds even works, even though it is inefficient at 3 mana.
Sorcerous Spyglass goes in any deck and is pseudo removal for planeswalkers, vehicles, artifacts, activated abilities like that belonging to scarab god - as it is an artifact it can go in any deck.
Those are my first thoughts after a quick glance at your deck, mostly about your point that white might not have the best removal - there are some good ones. I agree with the previous poster about
sanguine sacrament; it seems out of place, a reliably repeatable lifegain effect (maybe a
lifelink creature like
sacred cat) would be better, I think. Anyway, I love cat tribal, and I think lifegain strategies give a player so much time to get things assembled. I hope you have fun playing it - come back and tell us how it does.
Thanks for sharing your idea!