A: In fact, it is not unusual that the missionaries of Christianity, Judaism, and other destructive creeds do their best to penetrate Muslims. Allah (Exalted be He) told us about this in Noble Qur'an, Never will the Jews nor the Christians be pleased with you (O Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴﻪ ﻭﺳﻠﻢ) till you follow their religion. Say: "Verily, the Guidance of Allâh (i.e. Islâmic Monotheism) that is the (only) Guidance. And if you (O Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴﻪ ﻭﺳﻠﻢ) were to follow their (Jews and Christians) desires after what you have received of Knowledge (i.e. the Qur'ân), then you would have against Allâh neither any Walî (protector or guardian) nor any helper. and, And they will never cease fighting you until they turn you back from your religion (Islâmic Monotheism) if they can.