I converting to Quranism from Sunni:?

According to Quran, only prophet Muhammad(pbuh) was infallible, and only his authorized revelation from God, the Quran, is to be followed. If even one hadith can be proven false, as many are, then that places doubt on all hadiths, because if one author can be fallible, then all can be, too. The day after the prophet died, when there were not any hadiths, how did the Muslims practice their religion? This proves that all Hadiths can be either right or wrong, but since we cannot go back in time to verify their claims, and all humans, besides Muhammad, are fallible, then we cannot trust any hadiths. God gave us a divine book to follow, the Quran, like his previous books, Bible and Torah; and similarly, Jews and Christians only follow their books--and not other texts. We can be confident that the Quran has been preserved to its exactness since its creation, but the hadiths are professed by mortal men who tend to deviate, especially when narrations are changed as they go through different sources. What do you think?