Thats the most contradictory thing Ive ever heard. You cant be both Christian and another Religion at the same time, since that contradicts against what being a christian really is. Heres an example where you can't be both a Christian and Wiccan.
"19The acts of the sinful nature are obvious: sexual immorality, impurity and debauchery; 20idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions 21and envy; drunkenness, orgies, and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God."
Galatians 5:19-21