Christianity and Islam both derive a lot from Judaism but European Christianity has a lot more Roman and other European paganism than they ever admit. There is that minor inconvenience of JC being Jewish.

Are Catholic nuns similar to the Vestal Virgins of Rome?

Easter comes from Esther, some German goddess.

Easter is the first Sunday after the first full moon after spring equinox. Why do you suppose it varies by as much as 5 weeks? What sense does that make?

The moon, sun, equinox, and Easter's elusive dating -- baltimoresun.com

There are probably books and books about the amount of paganism in European Christianity but they are for the religious scholars not the peons that are supposed to BELIEVE.

umbra