He is able to preserve us cause he is at work getting out all the stuff that would cause us to rot. God is washing the carnal desires away. It is the fleshly man that is tempted. He is the one who must be cleansed. He is able to preserve us in temptation.
Most heresies come because of the desire to give into temptation.
Some feel that they can get away from calling it sin if the church sanctions it. We can sin and still be religious. Moses came off the mountain with the Ten Command- ments. Israel had fallen into sin. It was religious.