If the cross it self has sentimental or aesthetic value then by all means leave it up.
If it bothers you that it is a xtian artifact then simply invert it and you get to keep the sentimental value and remove the xtian symbolism behind it.
"After an inferior man has been taught a doctrine of superiority he will remain as inferior as he was before his lesson. He will merely assume himself to be superior, and attempt to employ his recently learned tactics against his own kind, whom he will then consider his inferiors. With each inferior man enjoying what he considers his unique role, the entire bunch will be reduced to a pack of strutting, foppish, self-centered monkeys gamboling about on an island of ignorance. There they will play their games under the supervision of their keeper, who was and will always be a superior man."
-Magus Anton Szandor LaVey (The Devil's Notebook, "Diabolica")Undefiled Wisdom
**Formerly known as "Romenadan"**