the demons always say believe in jesus christ, but they won't accept him as lord.  if you accept him as lord, you would obey him. because he is. and since the lord set up his church as the way to salvation (there is no other path) - you obey the precepts of the church, as they have this authority. that's why peter is shown at the gate of heaven. he is the controller. belief is not enough, you must obey.
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