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wa-law shāʾa llāhu mā ʾashrakū wa-mā jaʿalnāka ʿalayhim ḥafīẓan wa-mā ʾanta ʿalayhim bi-wakīlin
Had Allah wished they would not have ascribed partners [to Him]. We have not made you a caretaker for them, nor is it your duty to watch over them.
— Ali Quli Qarai
Surah Al-‘An’am, Verse 107
107. "And had Allah pleased, they would not have associated others (with Him), and We have not made you a keeper over them, nor are you over them a guardian."
This fact is confirmed again in this verse that Allah does not please to force them to believe in Truth.
Also, the holy verse emphasizes on the same subject that was mentioned before, saying:
As your duty is not to force them to believe, then:
The tones of these verses are greatly considerable from this point of view that belief in Allah and in Islam can never have the obligatory state. Hence progression in this way should be performed through the way of logic, reasoning and penetrating in the souls and minds of people. The reason of this idea is that an obligatory belief is worthless. The important matter is that people comprehend the facts and accept them with their own authority and will.