And yes we are all made in the image of God -but we are not all children of God. some are children of the evil one.and they are of the vine of sodom and of Gomorrah. Only those who hear and obey are of Christs' family according to Johns' Gospel.
I agree with you on most things...except the "children of the devil" part. I don't think the devil has children. I think there are believers and unbelievers. But this is a rabbit trail on this thread.