Plastic Jesus is an American folk song written by Ed Rush and George Cromarty in 1957, some also attribute Ernie Marrs as a writer. Ed Rush has stated that the inspiration for the song came from a religious radio station from Del Rio, Texas which "sold the most outrageous stuff imaginable, all with magical healing properties." Every city in America probably has such a shop, selling tacky religious trinkets and doodads. In Birmingham, we had Prophet Carlisle who sold scented candles and healing oils. Christians need to assiduously separate themselves from such crap. There is no reason to give the unbelievers ammunition for their sarcasm.
Plastic Jesus has been recorded by multiple artists. Additional verses continue to be added about Mary, Joseph, the Apostles, Moses, Buddha, Krishna, and on and on and on. Here is the original song. Read more about it on Wikipedia.
I don't care if it rains or freezes
'Long as I got my plastic Jesus
Riding on the dashboard of my car
Through my trials and tribulations
And my travels through the nations
With my plastic Jesus I'll go far
Plastic Jesus, plastic Jesus
Riding on the dashboard of my car
I'm afraid He'll have to go
His magnets ruin my radio
And if I have a wreck He'll leave a scar
Riding down a thoroughfare
With His nose up in the air
A wreck may be ahead, but He don't mind
Trouble coming He don't see
He just keeps His eye on me
And any other thing that lies behind
Plastic Jesus, plastic Jesus
Riding on the dashboard of my car
Though the sunshine on His back
Make Him peel, chip and crack
A little patching keeps Him up to par
When I'm in a traffic jam
He don't care if I say "damn"
I can let all my curses roll
Plastic Jesus doesn't hear
'Cause he has a plastic ear
The man who invented plastic saved my soul
Plastic Jesus, plastic Jesus
Riding on the dashboard of my car
Once His robe was snowy white
Now it isn't quite so bright
Stained by the smoke of my cigar
If I weave around at night
And policemen think I'm tight
They never find my bottle, though they ask
Plastic Jesus shelters me
For His head comes off, you see
He's hollow, and I use Him for a flask
Plastic Jesus, plastic Jesus
Riding on the dashboard of my car
Ride with me and have a dram
Of the blood of the Lamb
Plastic Jesus is a holy bar
Another version of the song. And another. There are many.