Quanah Parker taught that the sacred peyote medicine was the sacrament given to the Indian peoples and was to be used with water when taking communion in a traditional Native American Church medicine ceremony. Quanah Parker was a proponent of the "half-moon" style of the peyote ceremony. The "cross" ceremony later evolved in Oklahoma because of Caddo influences introduced by John Wilson, a Caddo-Delaware religious leader who traveled extensively around the same time as Parker during the early days of the Native American Church movement.