The Certainty of Life after Death

Allah says: `Ask these people, those who deny the resurrection, which is harder to create Are they more difficult to create or the heavens, the earth, the angels, devils, the mighty creatures -- everything in between them' Ibn Mas`ud said that they admitted that these things were harder to create than they were. If this is the case, then why do they deny the resurrection, when they see things that are greater than that which they deny As Allah says:

لَخَلْقُ السَّمَـوَتِ وَالاٌّرْضِ أَكْـبَرُ مِنْ خَلْقِ النَّاسِ وَلَـكِنَّ أَكْـثَرَ النَّاسِ لاَ يَعْلَمُونَ

As for the reaction of disbelievers on rational proofs, it was said: بَلْ عَجِبْتَ وَيَسْخَرُ‌ونَ وَإِذَا ذُكِّرُ‌وا لَا يَذْكُرُ‌ونَ (But you wonder [ at their denial ], and they mock [ at the idea of an Hereafter ]. And when any advice is given to them, they pay no heed to it. – 12-13). Given here first is the stance of the Holy Prophet ﷺ who wonders as to how could these people, after having such clear proofs before them, still remain reluctant to accept the truth while these people, on the contrary, indulge in making fun of the proofs and beliefs presented by him before them. In fact, no amount of advice and counsel given to them works. They are just averse to any understanding.