It may not be 100% foolproof but it does work exceedingly well. Basically, if someone brings a doctrine or interpretation your way… bring up the relevant passages that appear to contradict their views and see how they respond to them or to the questions you ask in light of them. I. GREEN FLAGS It is…
Put on the whole armour of God, that ye may be able to stand against the wiles of the devil. For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
Spiritual Wrestlings 