Is celebrating his birth bad?
I think it's great to celebrate the arrival of our Saviour. We just need to be mindful the reason we celebrate is because we are so lost without him and what he did for us at Resurrection Sunday.
But if you need to read the Holy Word of Elohim. Do not follow the Pagan rituals of the Roman church. Luke 1 will lead you to His Birthday When He tabernacled among us. Resurrection Sunday was really the Feast of First Fruits. Again if you believe the Holy Word of Elohim.No.
b'SHEM Yah'shua
as it was on Sukkot(Feast of Tabernacles).