How do I respond to the Christian who claims that Christianity is more tolerant than Islam, and cites as evidence that they do not proselytize in Islamic countries for fear of Muslims being killed if they change their religion?

When engaging in dialogue with Christians, a Muslim should focus on strengthening their faith and arming themselves with religious knowledge to refute misconceptions. They should avoid argumentation without knowledge. It is also necessary to challenge them by highlighting their inconsistencies, the falsehood of the Trinity doctrine, and the corruption of their scriptures, all while inviting them [to Islam] with wisdom and good counsel. Islam has legislated the killing of an apostate after seeking their repentance, based on the Prophet’s (peace be upon him) saying: "Whoever changes his religion, kill him," and due to the apostate's trifling with religion and breaking of covenant.