Edit : To those who think this is a loaded question, it is based on historical facts. If you can please share your unloaded equivalent version of the question that would preserve the factual information, that would be great.
What is a word for turning dead into idols , e.g. making shrines to them.
It was something that was happening during the dark ages in Europe, where a bone was attributed to a Saint was used to make shrines/churches.
The Arabs after invading countries had a similar setup, where they forced the local populous to make shrines for their dead Arab invaders and ask them for miracles and healing ( A practice that is still going on at least in Iran ). The best word I can think to describe this is deadolatry ( Dead Idolatry )
Best Answer
The word you're looking for is necrolatry.