R
not really sure a cross which is a basic shape really fits in the category of idol.
Exodus 20:4 “You shall not make for yourself a carved image, or any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth."
So technically it does fit in the category. Did the appostles wear cross neclaces to remind them of Jesus? they had pendants neclaces and alsorts in them days too. But did they wear a crucifix and cross chains and neclaces? I don't think they did. The pagans was the ones that introduced all this symbolic rememberances.