Does one become an infidel by saying: "Hadith makes matters more ambiguous" and "Each is facilitated for that for which he was created"?

You did not intend to belie the Prophet, peace and blessings be upon him; rather, the matter became more complicated due to your lack of knowledge, and this is not disbelief (kufr). Non-jurists may err in understanding Hadith (definition) because they might take their apparent meaning without knowing their interpretation or the existence of other evidence, or because a Hadith has been abandoned for reasons known only to the knowledgeable scholar. Therefore, rid yourself of the whispers of declaring disbelief.