Theists watch this..

[Dystopia]

I don't think theism as belief in god is synonymous with not believing in creationism unless you are a bible literalist or believe in the stories of creation.
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But it should be, lest the believer start thinking it is OK to cherry pick other scriptures to comport to, and leaving other scriptures to ignore.
Putting the believer in charge instead of God seems like a REALLY bad idea to me.
Otherwise, why bother with God at all ??

theism is just believing in god, it doesn't even mean you follow a religion. You don't even need to read scriptures to be religious, you just need to believe. I've met many kinds of Christians to think only those who read the whole bible literally are right. Cherry picking depends on the believer - Some don't pick but openly reject some verses or consider them contradictory towards bigger teachings. For example when my girlfriend was a Christian she thought Loving the neighbour cancelled the verse about hating gays in Leviticus (seriously atheists seem to study more leviticus than Christians themselves)