Was Prophet Ibrahim in doubt when he asked how Allah brings life to the dead?
هل شك إبراهيم عليه السلام في قدرة الله في قوله تعالى "أرني كيف تحي الموتى"؟
He was sure but he wanted to move to the level of certainty. That is why he said, "Show me how", and he did not say, "Show me If you can". This distinction shows that the question was about the method, not the possibility.
بقوله "كيف" واضح بأنه كلام متيقن لكن أراد المزيد من اليقين. فهو أراد أن ينتقل من مرحلة علم اليقين إلى مرحلة عين اليقين. لذلك قال "أرني كيف" ولم يقل "إذا"، مما يؤكد تمام إيمانه بقدرة الخالق.
Quranic Evidence | الدليل من القرآن الكريم
(And remember when Abraham said, “My Lord! Show me how you give life to the dead.” Allah responded, “Do you not believe?” Abraham replied, “Yes I do, but just so my heart can be reassured.” Allah said, “Then bring four birds, train them to come to you, then cut them into pieces, and scatter them on different hilltops. Then call them back, they will fly to you in haste. And so you will know that Allah is Almighty, All-Wise.”)
(وَإِذْ قَالَ إِبْرَاهِيمُ رَبِّ أَرِنِي كَيْفَ تُحْيِي الْمَوْتَىٰ ۖ قَالَ أَوَلَمْ تُؤْمِن ۖ قَالَ بَلَىٰ وَلَٰكِن لِّيَطْمَئِنَّ قَلْبِي ۖ قَالَ فَخُذْ أَرْبَعَةً مِّنَ الطَّيْرِ فَصُرْهُنَّ إِلَيْكَ ثُمَّ اجْعَلْ عَلَىٰ كُلِّ جَبَلٍ مِّنْهُنَّ جُزْءًا ثُمَّ ادْعُهُنَّ يَأْتِينَكَ سَعْيًا ۚ وَاعْلَمْ أَنَّ اللَّهَ عَزِيزٌ حَكِيمٌ)
[سورة البقرة: آية ٢٦٠]