Yes, the Qur'an provides clear guidance on this matter. On the one hand, Allah states that guidance is entirely under His control, and on the other hand, He also makes it clear that human beings have been given intellect and free choice to accept or reject the truth. Allah does not wrong anyone. Rather, whoever sincerely seeks the truth, Allah opens the path of guidance for them, while whoever knowingly turns away from the truth out of arrogance, stubbornness, or deliberate rejection, Allah leaves them to the path they have chosen.

Allah says:

«﴿إِنَّكَ لَا تَهْدِي مَنْ أَحْبَبْتَ وَلَٰكِنَّ اللَّهَ يَهْدِي مَن يَشَاءُ﴾

“Indeed, you cannot guide whom you love, but Allah guides whom He wills.”

(Surah Al-Qasas 28:56)»

Allah also says:

«﴿وَالَّذِينَ اهْتَدَوْا زَادَهُمْ هُدًى وَآتَاهُمْ تَقْوَاهُمْ﴾

“As for those who accept guidance, He increases them in guidance and grants them their piety.”

(Surah Muhammad 47:17)»

And He says:

«﴿فَلَمَّا زَاغُوا أَزَاغَ اللَّهُ قُلُوبَهُمْ﴾

“So when they deviated, Allah caused their hearts to deviate.”

(Surah As-Saff 61:5)»

These verses show that Allah's guidance is based on His perfect wisdom and justice. He does not misguide anyone arbitrarily or treat anyone unjustly.

As for the second question—whether it is the duty of Muslims to remind non-Muslims that true faith is granted only by Allah—the answer is yes, but with the correct understanding.

The responsibility of Muslims is to convey Allah's message, clarify the truth, and invite people to Islam with wisdom and good character. Creating faith in people's hearts is the work of Allah alone.

Allah says:

«﴿ادْعُ إِلَىٰ سَبِيلِ رَبِّكَ بِالْحِكْمَةِ وَالْمَوْعِظَةِ الْحَسَنَةِ﴾

“Invite to the way of your Lord with wisdom and good instruction.”

(Surah An-Nahl 16:125)»

And Allah said to the Prophet ﷺ:

«﴿فَإِنَّمَا عَلَيْكَ الْبَلَاغُ﴾

“Your duty is only to convey the message.”

(Surah Aal 'Imran 3:20; see also Surah Ash-Shura 42:48)»

For this reason, the Prophet ﷺ spent his entire life conveying the truth to people, yet he never considered it to be within his power to place faith in their hearts, because guidance belongs to Allah alone.

Therefore, Muslims should call people to Allah, clearly explain the truth, and pray for their guidance, while firmly believing that granting guidance belongs only to Allah, whereas conveying the message is the responsibility of His servants.