This is my experience with wof teachings:
Before i came to Christ i was a heroin addict and had gotten hep-c because of needle use, i used to be in alot of pain and was sick all the time. While i was in a christian rehab home, i was told, just pray God will heal you, one night i was extremely sick, had a fever over 104, instead of taking me to the hospital they told me to just pray and have faith, your not getting better because you don't have enough faith, when i eventually did get better, i questioned God, i thought He just didn't love me, i had been torn down, God did heal me of the hep-c, but it was in His timing. And listening to this garbage opened a door for them, after this they had me convinced i had some secret sin in my heart and that's why i was sick, God was punishing me for my sinful life, it took 3 years of counseling to believe that God really did love me. I also had a friend in that home who had bipolar, she was told she didn't need medicine, that medicine was the devil's work, all she needed to do was pray, she eventually went crazy and is now back to prostitution and smoking meth, this teaching tears new believers down, when God doesn't answer the prayer the believer thinks it's their fault, this teaching is dangerous and puts a stumbling block in front of those weak in the faith, quite a few years ago a little boy was having an asthma attack, his parents refused to give him his inhaler because of this teaching, they just prayed and asked God to heal him, the boy died, and the parents are now serving life in prison
This teaching is evil and destructive