Don't look now, but the afterlife of two realms (heaven, hell) are not particularly christian either. In fact, the word hell comes from the old norse hel, which was one of three places for the dead (valhalla and freyja's hall being the other two we know of). The whole idea of separate places for the dead based on their deeds in this life is far older than christianity.
I also recommend starting a war against monday, tuesday, wednesday, thursday, friday, saturday, and sunday as all those names are derived from pagan gods or concepts. Mon=moon, Tues=tyr, Wednes=Woden/Odin, Thur=thor, Fri=freyja/frigg, Satur=saturn*, Sun=well, the sun.
When you use those names, are you honoring pagan god(ess)s? You're at least recognizing them, which might not please your god.
*In scandinavia it's lordag, which equates with bath-day, since that's when the vikings would bath (or so goes the thought). So we have one day that's not actually related to viking mythology.