1- Before Islam people went astray:
2:198 It is no sin for you that ye seek the bounty of your Lord (by trading). But, when ye press on in the multitude from Arafat, remember Allah by the sacred monument. Remember Him as He hath guided you, although before ye were of those astray. لَيْسَ عَلَيْكُمْ جُنَاحٌ أَن تَبْتَغُواْ فَضْلاً مِّن رَّبِّكُمْ فَإِذَا أَفَضْتُم مِّنْ عَرَفَاتٍ فَاذْكُرُواْ اللّهَ عِندَ الْمَشْعَرِ الْحَرَامِ وَاذْكُرُوهُ كَمَا هَدَاكُمْ وَإِن كُنتُم مِّن قَبْلِهِ لَمِنَ الضَّآلِّينَ (2:198)
2- God guides to Islam and also take them away from Islam: this is because of what they earned both in their faith and deeds. Hypocrites at time of prophet were not passive disbelievers they were doing everything to harm Islam in wicked ways.
4:88 What aileth you that ye are become two parties regarding the hypocrites, when Allah cast them back (to disbelief) because of what they earned? Seek ye to guide him whom Allah hath sent astray? He whom Allah sendeth astray, for him thou (O Muhammad) canst not find a road.
فَمَا لَكُمْ فِي الْمُنَافِقِينَ فِئَتَيْنِ وَاللّهُ أَرْكَسَهُم بِمَا كَسَبُواْ أَتُرِيدُونَ أَن تَهْدُواْ مَنْ أَضَلَّ اللّهُ وَمَن يُضْلِلِ اللّهُ فَلَن تَجِدَ لَهُ سَبِيلاً (4:88)
4:143 Swaying between this (and that), (belonging) neither to these nor to those. He whom Allah causeth to go astray, thou (O Muhammad) wilt not find a way for him: مُّذَبْذَبِينَ بَيْنَ ذَلِكَ لاَ إِلَى هَـؤُلاء وَلاَ إِلَى هَـؤُلاء وَمَن يُضْلِلِ اللّهُ فَلَن تَجِدَ لَهُ سَبِيلاً (4:143)6:125 And whomsoever it is Allah's will to guide, He expandeth his bosom unto the Surrender, and whomsoever it is His will to send astray, He maketh his bosom close and narrow as if he were engaged in sheer ascent. Thus Allah layeth ignominy upon those who believe not. فَمَن يُرِدِ اللّهُ أَن يَهْدِيَهُ يَشْرَحْ صَدْرَهُ لِلإِسْلاَمِ وَمَن يُرِدْ أَن يُضِلَّهُ يَجْعَلْ صَدْرَهُ ضَيِّقًا حَرَجًا كَأَنَّمَا يَصَّعَّدُ فِي السَّمَاء كَذَلِكَ يَجْعَلُ اللّهُ الرِّجْسَ عَلَى الَّذِينَ لاَ يُؤْمِنُونَ (6:125)
3- Satan is the default if you reject God and his signs Satan takes over:
7:175 Recite unto them the tale of him to whom We gave Our revelations, but he sloughed them off, so Satan overtook him and he became of those who lead astray. وَاتْلُ عَلَيْهِمْ نَبَأَ الَّذِيَ آتَيْنَاهُ آيَاتِنَا فَانسَلَخَ مِنْهَا فَأَتْبَعَهُ الشَّيْطَانُ فَكَانَ مِنَ الْغَاوِينَ (7:175)
4- So it is mutual relation if you seek guidance he supports you: otherwise you chose to go astray. So you have the free will.
7:178 He who Allah leadeth, he indeed is led aright, while he whom Allah sendeth astray they indeed are losers. مَن يَهْدِ اللّهُ فَهُوَ الْمُهْتَدِي وَمَن يُضْلِلْ فَأُوْلَـئِكَ هُمُ الْخَاسِرُونَ (7:178)
7:186 Those whom Allah sendeth astray, there is no guide for them. He leaveth them to wander blindly on in their contumacy. مَن يُضْلِلِ اللّهُ فَلاَ هَادِيَ لَهُ وَيَذَرُهُمْ فِي طُغْيَانِهِمْ يَعْمَهُونَ (7:186)5- A common way to go astray is to deny God 's path: thus people who denied God path and unlike self-confessing sinners they root out his right to have us purify our selves are the one in deep fault and far astray.
14:3 Those who love the life of the world more than the Hereafter, and debar (men) from the way of Allah and would have it crooked: such are far astray. الَّذِينَ يَسْتَحِبُّونَ الْحَيَاةَ الدُّنْيَا عَلَى الآخِرَةِ وَيَصُدُّونَ عَن سَبِيلِ اللّهِ وَيَبْغُونَهَا عِوَجًا أُوْلَـئِكَ فِي ضَلاَلٍ بَعِيدٍ (14:3)
6- A lot of work that not related to God can take you astray: Know the right work which takes you to heaven which is submission to God. You can excel in science, art, sport, music, and so on and forget about the work that take you to heaven. So excel in your work and talent but make it add on to the true work which is submission to God. Thus if you are a comedian and wants people to laugh for God's pleasure you added on to your real work of submission.
18:103 Say: Shall We inform you who will be the greatest losers by their works? قُلْ هَلْ نُنَبِّئُكُمْ بِالْأَخْسَرِينَ أَعْمَالًا (18:103)
18:104 Those whose effort goeth astray in the life of the world, and yet they reckon that they do good work. الَّذِينَ ضَلَّ سَعْيُهُمْ فِي الْحَيَاةِ الدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا (18:104)
18:105 Those are they who disbelieve in the revelations of their Lord and in the meeting with Him. Therefore their works are vain, and on the Day of Resurrection We assign no weight to them. أُولَئِكَ الَّذِينَ كَفَرُوا بِآيَاتِ رَبِّهِمْ وَلِقَائِهِ فَحَبِطَتْ أَعْمَالُهُمْ فَلَا نُقِيمُ لَهُمْ يَوْمَ الْقِيَامَةِ وَزْنًا (18:105)
7- We asked as Muslims to read to all people the Quran : the benefit is for the people who are guided and if they to go astray we are just warners.
27:92 And to recite the Qur'an. And whoso goeth right, goeth right only for (the good of) his own soul; and as for him who goeth astray (unto him) say: Lo! I am only a warner. وَأَنْ أَتْلُوَ الْقُرْآنَ فَمَنِ اهْتَدَى فَإِنَّمَا يَهْتَدِي لِنَفْسِهِ وَمَن ضَلَّ فَقُلْ إِنَّمَا أَنَا مِنَ الْمُنذِرِينَ (27:92)8- If they do not listen to the Quran and goes astray they have no support in the day of judgement:
42:44 He whom Allah sendeth astray, for him there is no protecting friend after Him. And thou (Muhammad) wilt see the evil doers when they see the doom, (how) they say: Is there any way of return? وَمَن يُضْلِلِ اللَّهُ فَمَا لَهُ مِن وَلِيٍّ مِّن بَعْدِهِ وَتَرَى الظَّالِمِينَ لَمَّا رَأَوُا الْعَذَابَ يَقُولُونَ هَلْ إِلَى مَرَدٍّ مِّن سَبِيلٍ (42:44)
42:46 And they will have no protecting friends to help them instead of Allah. He whom Allah sendeth astray, for him there is no road. وَمَا كَانَ لَهُم مِّنْ أَوْلِيَاء يَنصُرُونَهُم مِّن دُونِ اللَّهِ وَمَن يُضْلِلِ اللَّهُ فَمَا لَهُ مِن سَبِيلٍ (42:46
45:23 Hast thou seen him who maketh his desire his god, and Allah sendeth him astray purposely, and sealeth up his hearing and his heart, and setteth on his sight a covering? Then who will lead him after Allah (hath condemned him)? Will ye not then heed? أَفَرَأَيْتَ مَنِ اتَّخَذَ إِلَهَهُ هَوَاهُ وَأَضَلَّهُ اللَّهُ عَلَى عِلْمٍ وَخَتَمَ عَلَى سَمْعِهِ وَقَلْبِهِ وَجَعَلَ عَلَى بَصَرِهِ غِشَاوَةً فَمَن يَهْدِيهِ مِن بَعْدِ اللَّهِ أَفَلَا تَذَكَّرُونَ (
17:97 And he whom Allah guideth, he is led aright; while, as for him whom He sendeth astray, for them thou wilt find no protecting friends beside Him, and We shall assemble them on the Day of Resurrection on their faces, blind, dumb and deaf; their habitation will be hell; whenever it abateth, We increase the flame for them. وَمَن يَهْدِ اللّهُ فَهُوَ الْمُهْتَدِ وَمَن يُضْلِلْ فَلَن تَجِدَ لَهُمْ أَوْلِيَاء مِن دُونِهِ وَنَحْشُرُهُمْ يَوْمَ الْقِيَامَةِ عَلَى وُجُوهِهِمْ عُمْيًا وَبُكْمًا وَصُمًّا مَّأْوَاهُمْ جَهَنَّمُ كُلَّمَا خَبَتْ زِدْنَاهُمْ سَعِيرًا (17:97)