Final answer:
The central idea of Luther's teachings and Protestant denominations was 'Justification by faith,' emphasizing salvation through faith in God and rejecting indulgences and good works.
Explanation:
Justification by faith was the central idea of Luther's teachings, which became the basic tenet of all Protestant denominations. Luther emphasized that salvation could only be gained through faith in God, rejecting the idea of earning salvation through good works or indulgences.
His theology revolved around the concept of Justification by Faith, challenging the authority of the Catholic Church and emphasizing the Priethood of all Believers. Luther's translation of the Bible into German and subsequent spread of Protestantism across Europe further solidified these key beliefs.
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