If christians have faith enough, why can't they have the power to grow limbs on amputees? Faith appears to be subjective to only the believer since the results is not verifiable.The "gifts of the Spirit" have ceased, but Jesus said to ask anything in His name FAITH BELIEVING and it shall be given us. "Let God be True and every man a liar".
So faith has no accountablity, no testability, and cannot be scientifically verified, except for claims by the religious. Can you see how this places a dilemma on the person making a claim of faith to athiests.