What is the way to study Christianity and specialize in confronting Christians, and to devise an academic program for that?

Since those who espouse falsehood are diligent in their falsehood, it is more befitting for a Muslim to be even more diligent in spreading the truth and striving to guide people, relying on the saying of the Prophet, peace and blessings be upon him: "For Allah to guide a single man through you is better for you than having red camels." The caller to Islam must specialize in refuting Christians by studying sound doctrine and Islamic knowledge, and by paying attention to specialized references in da'wah to Christians, while adhering to the ethics of fairness and compassion, and debating them in the best manner.