Jewish and Muslim organisations are staging a joint protest in the German capital Berlin over a regional court's ruling that the circumcision of young boys constituted bodily harm.
The protest was prompted by the news that a rabbi in Bavaria was being investigated over the practice.
The ruling on circumcision was handed down by a court in Cologne in June.
However, the German government has since announced it will legislate to explicitly legalise the practice.
The court in Cologne had declared that the ritual circumcision of a Muslim boy, in accordance with his parents' faith, caused the child "bodily harm".
The German Medical Association then told doctors across the country to stop performing the procedure for both Jews and Muslims.
International condemnationOn Wednesday, the state government in Berlin announced that circumcision was legal there, as long as the procedure was carried out according to certain conditions.
The federal government, perhaps upset at international condemnation, has also said it wants to legislate to explicitly legalise circumcision, the BBC's Stephen Evans in Berlin reports.
There has also been renewed debate over the practice in the US, one of the countries where it is most prevalent.
Last month, the American Academy of Pediatrics (AAP) published a review of scientific evidence on the practice, saying it showed "the health benefits of newborn male circumcision outweigh the risks of the procedure".
However, the AAP added it did not recommend circumcision for all newborn boys, saying the decision was best left to parents, in consultation with doctors.
