Final answer:
Ulrich Zwingli sought to unify his church with that of Luther's by challenging Catholic doctrines and calling for the Church to be reformed, similar to the efforts of Martin Luther. Despite their efforts at the Marburg Colloquy, they could not reconcile differences on Eucharist doctrine, preventing a full unification of their movements.
Step-by-step explanation:
Ulrich Zwingli took significant actions to attempt to unify his church with that of Martin Luther during the Protestant Reformation. Zwingli, a priest in Zurich, Switzerland, called for radical changes within the Catholic Church that aligned with the reformation efforts initiated by Luther. These changes included a rejection of the doctrine of transubstantiation, criticism of fasting, advocating for the removal of religious imagery in churches, and challenging the practice of clerical celibacy. Despite some differences in their doctrines, both Zwingli and Luther wanted to reform the Church and make the Bible accessible to ordinary people in their native language.
Efforts for unification came to a head during the Marburg Colloquy in 1529, where Zwingli and Luther met to discuss their theological differences in the hope of forming a united Protestant front against the Catholic Church. Nonetheless, the two reformers failed to agree on the presence of Christ in the Eucharist, which ultimately prevented their churches from merging. Zwingli's efforts for reform and unity, however, continued to have a profound impact on the course of the Reformation, despite the differences that remained between the Lutheran and Zwinglian movements.