Well obviously calling your earthly father a "father" isn't wrong.
Gen 2:24 Therefore shall a man leave his
father and his mother, and shall cleave unto his wife: and they shall be one flesh.
Moses writes it down (under the inspiration of God) that our earthly father is indeed our father.
Mat 10:21 And the brother shall deliver up the brother to death, and the
father the child: and the children shall rise up against their parents, and cause them to be put to death.
Here Jesus calls an earthly father by the name father.
I'd suggest get
e-Sword and do a search of "father" and see how many you get.
All in all, it's not wrong to call an earthly father "father". I feel this is speaking of calling priests "fathers".
But still, this isn't a mandate to call earthly fathers "fathers" so this would come under the heading of a personal conviction.
Personal convictions are okay as long as they don't override the Bible's teachings. This one doesn't. So to each his own. It certainly isn't sin to do such a thing.
