It is well known that Europe through a historical process got disenchanted with religion, and reduced intellect and life to this world alone (see Religion & the Order of Nature, by Dr S H Nasr to study the change at the intellectual level; & ‘The Origins of Western Social Sciences’ by Dr Asad to study the ‘disenchantment’ process). What are the results? To sum it up:
”We live among ruins in a World in which ‘god is dead’ as Nietzsche stated. The ideals of today are comfort, expediency, surface knowledge, disregard for one’s ancestral heritage and traditions, catering to the lowest standards of taste and intelligence, apotheosis of the pathetic, hoarding of material objects and possessions, disrespect for all that is inherently higher and better — in other words a complete inversion of true values and ideals, the raising of the victory flag of ignorance and the banner of degeneracy. In such a time, social decadence is so widespread that it appears as a natural component of all political institutions. The crises that dominate the daily lives of our societies are part of a secret occult war to remove the support of spiritual and traditional values in order to turn man into a passive instrument of dark powers.”
This is – put very mildly – the kind of world that secular modern education has produced. Because the secular worldview remains undecided about Principles (and hence ultimate values), and in fact declares values as non-scientific, it has legalized and accepted the most immoral of activities: hoarding, selfishness, usury, betting & derivatives, homosexuality, desecration of sacred histories & figures, environmental crises, etc. Therefore, as Dr Nasr once said, no knowledge is abstract or value-free. Every knowledge has a worldview attached to it. So if someone asks for totally eliminating Islam from all subjects except Islamiyat he is practically arguing for educating as per secular worldview which rejects Revelation as a code of life in most comprehensive way. Islam is against compartmentalization of life, and life and education must be regulated according to Sacred Principles and laws.