So since Jews even say that Jesus isn't mentioned in the Talmud, why believe he even existed?

Why does it even matter if he existed or didnt exist?? He was a mere man, I was born Jewish because my parents were jewish but I beleive in spirituality. I am spiritual so I do not beleiev in any organised religion or any one man wether he be a religious Rabbi, priest or Imam. I do not follow a mere man like most the sheep (ahammmm people) on this earth just because a mere man told me what to beleive. I do beleive in ONE GOD and it is not a god that sits in the sky, it is the god from within me - it is my spirit and my own very capable brain - Hence I beleive in myself and my power on this earth and not in any man including Jesus.