It takes only one to keep the belief going. There are religions out there about anything and everything, from worshiping stars to animals. Many people follow pagan religion with out even knowing it. Christmas, Easter, Valentines Day, New Years Eve/Day... All are pagan holidays. It even states in the holy bible that we SHOULD NOT bring a tree in the home and decorate it with gold and silver as it symbolizes thanks and worship of the earth, not God. So why is Christmas traditions such as the tree considered catholic or even christian is beyond me.
Jeremiah 10:2 KJV Thus saith the LORD, Learn not the way of the heathen, and be not dismayed at the signs of heaven; for the heathen are dismayed at them. 3* For the customs of the people are vain: for one cutteth a tree out of the forest, the work of the hands of the workman, with the axe. 4* They deck it with silver and with gold; they fasten it with nails and with hammers, that it move not. 5 They are upright as the palm tree, but speak not: they must needs be borne, because they cannot go. Be not afraid of them; for they cannot do evil, neither also is it in them to do good.