because successive sins destroy the ground that is conducive to knowing the truth and adhering to it in the human being and deprive him of the necessary success for it from God; as God Almighty has said: ﴿وَأَمَّا مَنْ بَخِلَ وَاسْتَغْنَى ۝ وَكَذَّبَ بِالْحُسْنَى ۝ فَسَنُيَسِّرُهُ لِلْعُسْرَى﴾[1]; “But as for one who is miserly and considers himself self-sufficient and denies goodness, We will ease him toward difficulty”; as piety and avoiding moral vices create the ground that is conducive to knowing the truth and adhering to it in the human being and expose him to divine success for it; as God Almighty has said: ﴿يَا أَيُّهَا الَّذِينَ آمَنُوا إِنْ تَتَّقُوا اللَّهَ يَجْعَلْ لَكُمْ فُرْقَانًا﴾[2]; “O you who believed! If you fear God, He will provide you with a criterion (to distinguish between right and wrong).”

As a result, moral vices, such as worldliness, fanaticism, selfishness, envy, malice, individualism, villainy, laziness, fear, love of power, following lust, and submission to oppression, are major impediments to the establishment of Islam, and therefore, the higher the level of piety and moral virtues among Muslims through purifying themselves, the easier it will be for them to return to Islam.

7. Hindrance of the enemies of Islam

Another cause of non-establishment of Islam, especially in the last two centuries, has been the hindrance of the enemies of Islam to its establishment; because the enemies of Islam consider its establishment as a means of the destruction of themselves and the destruction of their possessions in the worldly life, and that is why they spare no effort to stop it. It is clear that the purpose of Islam is justice, and justice is harmful to powerful people who have enslaved free nations of the world politically and culturally through their military power and propaganda facilities; because it puts an end to the period of their domination over the world and replaces them with the oppressed masses; as God has said in this regard: ﴿وَنُرِيدُ أَنْ نَمُنَّ عَلَى الَّذِينَ اسْتُضْعِفُوا فِي الْأَرْضِ وَنَجْعَلَهُمْ أَئِمَّةً وَنَجْعَلَهُمُ الْوَارِثِينَ ۝ وَنُمَكِّنَ لَهُمْ فِي الْأَرْضِ وَنُرِيَ فِرْعَوْنَ وَهَامَانَ وَجُنُودَهُمَا مِنْهُمْ مَا كَانُوا يَحْذَرُونَ﴾[3]; “And it is Our will to confer a favor upon those who were oppressed on the earth and to make them leaders and to make them inheritors; and to grant them power on the earth and to make Pharaoh, Haman, and their hosts see from them what they feared.”