Answer
In his critique of the Catholic Church, Thomas Müntzer particularly scrutinized the sacrament of the Eucharist. He rejected the concept of transubstantiation, which holds that the bread and wine used in the sacrament literally transform into the body and blood of Christ. Instead, Müntzer argued for a more spiritual interpretation of the Eucharist, emphasizing the symbolic representation of Christ's sacrifice and the importance of faith in receiving its benefits.