Guidelines on How to Call a Non-Muslim to Islam

Question:
This is a message sent by a listener from Syria. He says: If we want to call a person to the Islamic religion, how do we begin this call? Please guide us on this topic. May Allah reward you with good.

Answer:
The beginning starts by encouraging him in Islam and explaining that Islam is the religion of Allah, by which He sent the messengers, sent down the books, and sent the last of the prophets, their seal, Muhammad (peace and blessings be upon him). It is obligatory for all the inhabitants of the earth to enter Islam and adhere to it. This is obligatory for all the inhabitants of the earth, including the Jews, the Christians, the communists, and others. All the inhabitants of the earth, men and women, must enter Islam, embrace it, hold fast to it, and remain steadfast upon it. This is because Allah created the creation to worship Him, and this worship for which they were created is Islam, by which Allah sent the messengers and sent Muhammad (peace and blessings be upon him). He made his Shari'ah abrogating all other Shari'ahs, abrogating the Shari'ah of the Torah and the Gospel, and all forms of worship on earth. The Shari'ah of Muhammad (peace and blessings be upon him) abrogates all of that. It is obligatory to adopt it and hold fast to it for all the inhabitants of the earth.
So, explain to him that Islam is the religion of Allah, and that it is the religion by which Allah sent Muhammad (peace and blessings be upon him), and it is the religion of all the prophets before him. Its foundation and basis is the testimony that there is no god but Allah and that Muhammad is the Messenger of Allah. So, teach him the two testimonies first, and teach him their meanings. Then teach him the prayer, the alms, fasting, and the pilgrimage, and the six pillars of faith, and help him understand their meanings. Teach him that he must disavow all religions that contradict Islam, such as the religion of the Christians and others.
He must disavow every religion that contradicts Islam and believe that 'Isa is the servant of Allah and His messenger, His word which He cast to Maryam, and a spirit from Him. If he is a Christian, teach him that 'Isa is the servant of Allah and His messenger, created by Allah from a female without a male. Allah said to him: "Be, and he was." So, it is obligatory to believe that he is the servant of Allah and His messenger, not Allah, not the son of Allah, and not the third of three. Rather, he is the servant of Allah and His messenger, created by Allah from a female, who is Maryam the chaste, the truthful woman (may Allah be pleased with her). He has no father. Allah said to him: "Be, and he was." So, the servant must believe in this, affirm this, and disavow the way of the Jews and the Christians in this matter. Yes.