I agree with you that Jesus is a myth. I believe that most of the characteristics of Jesus were taken from the God Serapis, a high bread god which included Osiris, Apis bull, and several Greek gods.
Horus did fight his father enemy Seth and win he also in some stories takes on the power of Ra after his mom Isis tricks Ra.
There is a temple in Egypt where they used to celebrate the resurrection of Osiris after three days.
One of the problems with Gerald Massey is some of the things he wrote can't be confirmed also he was a Druid and an evolutionist so people believe he was trying to turn people away from Christianity.
Again because I was able to prove some of the things he wrote and were in the documentary Zietgiest wrong, I stayed in the cult of JW for a few more years and haven't been able to get my wife out. Yet at the time Zietgiest came out and we watched it, if it had been more accurate I could of gotten her out too since she was more open minded at the time.