Enyart is OSAS, but you are wrong to think that non-OSAS denies God's power to keep us (Jude 24-25). The problem is that just as His saving power and grace can be resisted/rejected (vs universalism), so His keeping power/grace can be rejected/resisted. There is a conditional element in salvation/perseverance because things are relational/love-based, not mechanistic/deterministic. If you want to whine about God keeping us/power, then you will have to be a false universalist to be consistent (Lk. 7:30; Mt. 23:37 just because God's will is not always done due to free will, it does not mean God is not omnipotent).