Even Satan can teach from scripture in order to deceive. Your transformation should be from an Adamic nature to a Christ like one. It's the power of the word/scripture that transforms, not a human or demonic giver of it. If you compare how Christ, the apostles, Barnabas, Timothy, Stephen, etc, conducted their lives with how Andrew Wommack has conducted his, they're chalk and cheese.
You can be a good teacher of scripture, but not necessarily a good, or rather a true, follower of Christ. It's best we be very discerning about Who we should imitate, and who not.