How do we do Salat without Hadith?
Single-handedly, the most common argument Sunnis give against following the Quran alone is asking, “How do we do Salat without the Hadith?”
The irony of this question is that there is no single Hadith in the Sunni Hadith corpus that explains in detail how to do Salat from start to finish. Not only that, but even if you compiled all the Hadith on the topic and give it to a neutral party for them to reconstruct how to do the Salat from Hadith sources, not only will they be incapable of achieving such an outcome, but the Hadith are highly contradictory regarding even the items of Salat that it supposedly covers.
Even the most basic facts of Salat are in dispute once the Hadith are used as a source. For example, there is uncertainty as to if the Bismillah is part of the Fateah or not and if it should be recited in the Salat. In addition, even the aspects that are discussed in the Quran are neglected by the Sunnis, who favor following the Hadith. For example, the Quran tells the believers to recite their Salat in a moderate tone, yet traditionalists do two of their Salat quietly.
17:110 Say, “Call Him GOD, or call Him Most Gracious; whichever name you use, to Him belongs the best names.” You shall not utter your Contact Prayers (Salat) too loudly, nor secretly; use a moderate tone.
قُلِ ٱدْعُوا۟ ٱللَّهَ أَوِ ٱدْعُوا۟ ٱلرَّحْمَـٰنَ أَيًّا مَّا تَدْعُوا۟ فَلَهُ ٱلْأَسْمَآءُ ٱلْحُسْنَىٰ وَلَا تَجْهَرْ بِصَلَاتِكَ وَلَا تُخَافِتْ بِهَا وَٱبْتَغِ بَيْنَ ذَٰلِكَ سَبِيلًا