Original sentence: People believe that the primary sources about him and his teachings are the four Gospels, according to which he was a Jewish preacher often at odds with other Jewish preachers at that time.Some secular historians accept his existence.Those gospels focus mostly on his last one to three years, particularly the last week before his alleged death by crucifixion, which, based on some historical data mentioned, would have been about AD 29–33.Though mention is made of Jesus in the complete works of Josephus (thought by most secular and many religious scholars to be a forgery), nothing exists outside of the canonical Christian texts
Edited sentence: Almost all secular historians accept his existence, but calculate the birth and death dates given above based on independently known events implied or mentioned in the New Testament.The primary sources about him and his teachings are the four Gospels, according to which he was a Jewish preacher often at odds with other Jewish preachers at that time.Those gospels focus mostly on his last one to three years, particularly the last week before a death by crucifixion, which, based on some historical data mentioned, would have been about AD 29–33.Though mention is made of Jesus in the complete works of Josephus (thought by many secular scholars to be a forgery), nothing exists outside of the canonical Christian texts