Some of them are "on their way" toward doing exactly that...some conversions are sudden; others like molasses.
Some of the ambivalent ones try to say, "Well, look at Solomon & his cavorting...yet God used him." (And/Or they will point to the moral failings of other OT leaders)
With most of these failings in the OT, they were individual acts (vs. lifestyles)...obviously Solomon's failings were "lifestyle" issues...a heart turned away from God by his wives & concubines...