What are the major sins in Islam?

Tafsir Ibn Kathir, chapter 6, surah 12, and surahs 15, 16, 17:

The Messenger of Allāh says: “You make the people believe what they do not know.” (Sunan, Surat-an-nur, Book of the Commandments, Chapter 20: This is quoted verbatim by Abu’l-Hasan al-Ash’ari, Imam al-Tirmidhi, and al-Bayhaqi.) The reason they do so is because they have not been told that their religion is true, so they believe everything that they are told. But this is what they have not yet been told, so they become like those who were never taught. They do not know that which they are taught to know.

“He who doubts, is a doubter for the most important, and the most dangerous thing which he may have is on the wrong road.” ‘Abdu’l-Bahá (Qur’ān, Chapter 1, ayah 4).

What is the best way to convert somebody to Islam?

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Tafsir Ibn Kathir, surah 2, surahs 5-6, and surah 24:

A Muslim is not obliged to convert unless they have been forced to do so by circumstances.

Therefore, if he has given into them some sins, they will become his allies who would never have betrayed him had he not given over to them. They would remain loyal to him because they will realize that he has been betrayed. Likewise if a Muslim gives up some worldly pleasures to embrace the religion of Allāh, he shall become in accordance with his desires, and is obliged to go forth to follow the religion of Allāh by means of what Allah has revealed in this verse: “O people! If you fear a humiliating chastisement or the painful doom, then remember Allah’s favor upon you and give up all that which you have taken as your gain. Allah is sufficient for you. To Allah belongs whatever is in the earth or whatever comes from heaven. Verily, Allah is Exalted in Might and Wise.” (Surah al-A’raaf, Chapter 4)

A Muslim is not obliged to be persuaded to convert. This will come over him if he is in a state of distress and need, and in such a state he does not feel confident in the Religion of Allāh. “It [rejection to Islam] is