The existence of any historical figure rises and falls on its own merits. How reliable or unreliable writings are of one figure has no bearing on the other. If there's nothing on Jesus there's nothing on Jesus regardless of what is known or unknown of anyone else.
The importance of the other documents is figuring out the genre of the gospels. You, for example, state that they gospels are myths. Yet you have read so little of ancient history or of ancient myths you aren't able to tell the difference.
Having read only modern history, and then turning to the NT, it is no wonder that they seem to be anything other than historically reliable. However, when one looks around at oral traditions, ancient historical genres, and ancient myth, not to mention studying the sociology of religions, not only do the gospels begin to look more like ancient history and less like ancient myth, it become impossible to explain the jesus sect without jesus.
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