Did Martin Luther go back to the Catholic Church?

No, Martin Luther did not return to the Catholic Church. After initiating the Reformation in 1517 by posting his Ninety-Five Theses, he remained a central figure in the Protestant movement. Luther's theological disagreements with the Catholic Church, particularly regarding salvation and the authority of Scripture, solidified his break from it. He continued to lead and influence the development of Lutheranism until his death in 1546.