One of the questions which I ask is on what basis to we rule out a lack of faith
Out of the abundance of the heart, the mouth speaks... if someone is continually saying they are not healed and they are all worried about it... they are not accepting God's promises as being true for them and instead are focused on things other than God's Word which has choked any faith they had on this issue out of their life... and now, they need a doctor and in many cases after that they need an undertaker.
Jesus prayed for a few folks and they were healed as they went forth (not healed immediately), so sometimes we need to accept God's promises, live God's promises, refuse to have plan B cause God is more than enough to deliver us from ANYTHING Jesus Christ has paid to deliver us from... and go forth acting as though we are healed.
Jesus did say the Kingdom of God works on seed time and harvest, so when you plant corn in your garden... you don't go out the next day and cry "it's not God's will for me to grow corn"

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