Which early Christian writer is known for his Apology to defend Christianity against atheism?

Justin Martyr is renowned for his early works that aimed to defend Christianity against accusations of atheism and misunderstanding. In his writings, especially in the "First Apology," he articulated the relationship between faith and reason, arguing that Christians should not be labeled as atheists for their rejection of the Roman pantheon. Instead, he emphasized the rationality and moral integrity of Christian beliefs, explaining that true knowledge of God could be found through Christ. Justin Martyr's emphasis on dialogue with Greco-Roman philosophy and his thoughtful engagement with contemporary culture made his defense of Christianity not only a theological but also an intellectual endeavor. His writings laid important groundwork in articulating the reasons for faith and helped establish a more respectful discourse between Christians and non-Christians at the time.