If you were Satan, which doctrine would you want to undermine? Which area of theology would you pervert, to prevent people from being saved? An individual may be wrong about the doctrine of the church or deny the millennial kingdom and yet doubtless be gloriously redeemed. However, if a person is wrong on the doctrine of salvation, specifically, the prerequisites for salvation, he misses the very heart of the gospel. One would expect Satan to attack in the area of soteriology.