Strange Coincidence?

I have been doing some research and found that a whole bunch of mythical and historically religious figures have so many things in common with the story of Jesus. How can it be that ATTIS, HORUS, KRISHNA, DIONYSUS and MITHRA were all born to a virgin mother on the 25th December..all had tremendous impacts on the prevailing consciousnesses of the time...all died and were resurrected after 3 days..THIS IS A SERIOUS QUESTION