Here is an article written by a Lutheran minister concerning the Christian symbolism of the rooster, and why it ended up on top of churches:
Cock-a-doodle-do.
For those who want the essence of this article in a nutshell:
The roofs of pagan Roman temples were typically adorned with weather vanes in the shape of tridents, in honor of the Roman god of the sea.
When these temples became Christian churches, the ancient Christians said, “Um…ok…those pagan tridents have GOT to go!!!”
(This was probably spoken in Latin; although I can’t remember what the Latin word for “um” is)
The trident weather vanes were replaced with rooster weather vanes. Ancient Christians saw the rooster being symbolic for different reasons:
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1) Peter denied Jesus, but Jesus still forgave him. The rooster reminds us that Jesus is willing to welcome back those who deny him but then seek his forgiveness.
2) The rooster crows very early in the morning, which is when Mark 16:2 says that Jesus rose from the dead. Christ, like the dawn of a new day, is the Light that scatters the darkness. The rooster reminds us that Christians are to be children of the light, and await each day as a new day in Christ.
3) Jesus told us to always be ready for his coming, and that he may come at any day or hour, including “at the crowing of the rooster” (Mark 13:35). Hence, the image of the rooster reminds Christians to be vigilant.**
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