What Does God Think? Part 1

How can people celebrate and/or commemorate the birth of Jesus Christ on December 25th, when it is not recorded in the Bible? The apostles and early church never observed any such Holy day. What is the significance of the date December 25th? Jesus Christ was not born on December 25, so who or what is it about? Where do all of the vain customs arise from? HOW / WHY DO CHRIST-HATING LOST PEOPLE LOVE THE "SPIRIT OF CHRISTMAS"? Has God ever instructed His children to use any pagan traditions in the worship or observation of His Son Jesus Christ? Has God ever told us NOT to utelize pagan customs for any reason? Is worshipping God some trivial matter with which we can invent new practices to suit our own whims? Are we to take pagan things and "make them" Christian? Are we at liberty to observe whatever traditions or customs we like? Does it matter to God?  Does the will of Christ govern worship, or does the will of man?