"Why would you leave the Witnesses, and Christianity, and then celebrate a holiday that is so Christian in nature and tradition"
Typical. She spent years trying to convince you that Christmas is Pagan. Now she is trying to convince you it's Christian. I learned the word Pagan was used in New Testament times to describe anything non-Xian. Pagan does not necessarily mean devil worship as the JWs would like us to believe.
A holiday is a cultural tradition. To some, it's a religious occassion. To me, it's not. Being a cultural tradition I can choose to celebrate it (or not celebrate it) to whatever extent I wish. I use holidays as a special day to celebrate the positive things about my life, to take time to be with my loved ones, etc. If others choose to add religion to their practices, that is fine and has no impact on me whatsoever.
So yes, I celebrate XMas in a non-religious way.