What was the clearest difference between Lutheranism and Catholicism?

Question

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The clearest difference between Lutheranism and Catholicism was the belief in justification by faith. While Catholicism taught that salvation was obtained through good works and sacraments, Lutheranism emphasized that salvation was obtained through faith in Jesus Christ alone. This difference was at the heart of the Protestant Reformation and led to significant theological and political divides between Lutheran and Catholic countries.

What Was the Clearest Difference Between Lutheranism and Catholicism