I don’t think the issue is God allowing anything, the issue is why the church is so ineffective in the area of healing. God has done all He’s going to do about sickness. He gave Jesus for our sins and for our sicknesses and He gave us the Holy Spirit to help us and to anoint us as we minister. Our ineffectiveness is because we’re more interested in church movie nights, pizza nights, game nights, dance, mime, and politics; we have little interest in preaching, teaching, praying or ministering in power (including healing). The more we minister as the early church did, the more we’ll have the same types of results as they did, as in Philip’s visit to Samaria or Stephen’s ministry in power (both in Acts). The spiritual rule is you can only reap what you sow – we are simply (corporately) sowing the wrong seed.

Blessings, brother.