Which of martin luthers disagreements with the catholic church do you think were most influenced by the renaissance idea of humanism

Luther believed that man can be saved by faith alone.  To him it is a more personal relationship with God. Like the humanists of the Renaissance era, he questioned by many of the Church’s use of sacraments and practices and concentrated more on the faith of person in Jesus Christ.  He also became disillusioned with the Church due to the many practices that he saw as corrupting the faith.  He was against the selling of indulgences which was salvation for the soul by either performing a good deed or paying a sum of money.