The Romans - 30:43 So devote yourself to the true religion before a Day comes from Allah which cannot be reversed. On that Day they will be shocked.
The true religion:
Prophet Joseph/12:40 Those whom you serve besides Him are but names invented by you and your fathers. Allah has not given them any power. The judgment belongs to Allah alone. He has commanded you to serve Him alone. This is the true religion. But most of the people do not know this.
مَا تَعْبُدُونَ مِنْ دُونِه۪ٓ اِلَّٓا اَسْمَٓاءً سَمَّيْتُمُوهَٓا اَنْتُمْ وَاٰبَٓاؤُ۬كُمْ مَٓا اَنْزَلَ اللّٰهُ بِهَا مِنْ سُلْطَانٍۜ اِنِ الْحُكْمُ اِلَّا لِلّٰهِۜ اَمَرَ اَلَّا تَعْبُدُٓوا اِلَّٓا اِيَّاهُۜ ذٰلِكَ الدّ۪ينُ الْقَيِّمُ وَلٰكِنَّ اَكْثَرَ النَّاسِ لَا يَعْلَمُونَ

The Clear Evidence/98:5 But they were asked to serve Him as monotheists whose religion belongs to Allah alone, and to observe prayer and pay the zakat. This is the true religion.
وَمَٓا اُمِرُٓوا اِلَّا لِيَعْبُدُوا اللّٰهَ مُخْلِص۪ينَ لَهُ الدّ۪ينَ حُنَفَٓاءَ وَيُق۪يمُوا الصَّلٰوةَ وَيُؤْتُوا الزَّكٰوةَ وَذٰلِكَ د۪ينُ الْقَيِّمَةِۜ

The Cow/2:130 None turns away from the religion of Abraham except the one who deceives himself. We chose him in this world, and in the Hereafter he will be among the righteous.
وَمَنْ يَرْغَبُ عَنْ مِلَّةِ اِبْرٰه۪يمَ اِلَّا مَنْ سَفِهَ نَفْسَهُۜ وَلَقَدِ اصْطَفَيْنَاهُ فِي الدُّنْيَاۚ وَاِنَّهُ فِي الْاٰخِرَةِ لَمِنَ الصَّالِح۪ينَ

The Romans/30:43 So devote yourself to the true religion before a Day comes from Allah which cannot be reversed. On that Day they will be shocked.
فَاَقِمْ وَجْهَكَ لِلدّ۪ينِ الْقَيِّمِ مِنْ قَبْلِ اَنْ يَأْتِيَ يَوْمٌ لَا مَرَدَّ لَهُ مِنَ اللّٰهِ يَوْمَئِذٍ يَصَّدَّعُونَ

The Cow/2:135 "They said: "Become Jews or Christians so that you may be guided". Say: "No, we follow the monotheistic religion of Abraham. He was not of those who associate partners."
وَقَالُوا كُونُوا هُوداً اَوْ نَصَارٰى تَهْتَدُواۜ قُلْ بَلْ مِلَّةَ اِبْرٰه۪يمَ حَن۪يفاًۜ وَمَا كَانَ مِنَ الْمُشْرِك۪ينَ

The Family Of Imran/3:19 The only religion approved by Allah is Submission (Islam). Those who were given the Book, after the knowledge had come to them, differed only because of jealousy among themselves. Allah is swift in reckoning for those who deny the signs of Allah.
اِنَّ الدّ۪ينَ عِنْدَ اللّٰهِ الْاِسْلَامُ۠ وَمَا اخْتَلَفَ الَّذ۪ينَ اُو۫تُوا الْكِتَابَ اِلَّا مِنْ بَعْدِ مَا جَٓاءَهُمُ الْعِلْمُ بَغْياً بَيْنَهُمْۜ وَمَنْ يَكْفُرْ بِاٰيَاتِ اللّٰهِ فَاِنَّ اللّٰهَ سَر۪يعُ الْحِسَابِ
The Family Of Imran/3:68 The closest of mankind to Abraham are those who follow him, this prophet and those who believe. Allah is the sovereign and the friend of the believers.
اِنَّ اَوْلَى النَّاسِ بِاِبْرٰه۪يمَ لَلَّذ۪ينَ اتَّبَعُوهُ وَهٰذَا النَّبِيُّ وَالَّذ۪ينَ اٰمَنُواۜ وَاللّٰهُ وَلِيُّ الْمُؤْمِن۪ينَ
The Family Of Imran/3:85 Whoever seeks a religion other than Islam (submission to God), it will not be accepted from him, and he will be of the losers in the Hereafter.
وَمَنْ يَبْتَغِ غَيْرَ الْاِسْلَامِ د۪يناً فَلَنْ يُقْبَلَ مِنْهُۚ وَهُوَ فِي الْاٰخِرَةِ مِنَ الْخَاسِر۪ينَ
The Family Of Imran/3:95 "Say: "Allah speaks the truth; follow the monotheistic religion of Abraham. He was not of those who associate partners."
قُلْ صَدَقَ اللّٰهُ فَاتَّبِعُوا مِلَّةَ اِبْرٰه۪يمَ حَن۪يفاًۜ وَمَا كَانَ مِنَ الْمُشْرِك۪ينَ

The Women/4:125 Who has a better religion than he who submits to Allah and does good and follows the monotheistic religion of Abraham? Allah has taken Abraham as a friend.
وَمَنْ اَحْسَنُ د۪يناً مِمَّنْ اَسْلَمَ وَجْهَهُ لِلّٰهِ وَهُوَ مُحْسِنٌ وَاتَّبَعَ مِلَّةَ اِبْرٰه۪يمَ حَن۪يفاًۜ وَاتَّخَذَ اللّٰهُ اِبْرٰه۪يمَ خَل۪يلاً

The Cattle/6:161 "Say: "My Lord has guided me to the straight path: the perfect religion of Abraham, the monotheist. He was not of those who associate partners."
قُلْ اِنَّن۪ي هَدٰين۪ي رَبّ۪ٓي اِلٰى صِرَاطٍ مُسْتَق۪يمٍۚ د۪يناً قِيَماً مِلَّةَ اِبْرٰه۪يمَ حَن۪يفاًۚ وَمَا كَانَ مِنَ الْمُشْرِك۪ينَ

The Bee/16:123 Indeed, We revealed to you to follow the religion of Abraham as a monotheist; he was never of those who associate partners.
ثُمَّ اَوْحَيْنَٓا اِلَيْكَ اَنِ اتَّبِـعْ مِلَّةَ اِبْرٰه۪يمَ حَن۪يفاًۜ وَمَا كَانَ مِنَ الْمُشْرِك۪ينَ

The Pilgrimage/22:78 And strive and strive hard for the sake of Allah. It is He who has chosen you. He has not made this religion, which is the way of your father Abraham, difficult and burdensome for you. It is He Who has called you Muslims (Muslims) before and now, so that the Messenger may be a witness to you and you may be a witness to the people. Observe the prayer and pay the zakat and cling to Allah; He is your Owner. How good the Owner and how good the Helper!
وَجَاهِدُوا فِي اللّٰهِ حَقَّ جِهَادِه۪ۜ هُوَ اجْتَبٰيكُمْ وَمَا جَعَلَ عَلَيْكُمْ فِي الدّ۪ينِ مِنْ حَرَجٍۜ مِلَّةَ اَب۪يكُمْ اِبْرٰه۪يمَۜ هُوَ سَمّٰيكُمُ الْمُسْلِم۪ينَ مِنْ قَبْلُ وَف۪ي هٰذَا لِيَكُونَ الرَّسُولُ شَه۪يداً عَلَيْكُمْ وَتَكُونُوا شُهَدَٓاءَ عَلَى النَّاسِۚ فَاَق۪يمُوا الصَّلٰوةَ وَاٰتُوا الزَّكٰوةَ وَاعْتَصِمُوا بِاللّٰهِۜ هُوَ مَوْلٰيكُمْۚ فَنِعْمَ الْمَوْلٰى وَنِعْمَ النَّص۪يرُ