Question: A dispute arose among us over the judgment on a Muslim who wears a cross pendant, which is a symbol of Christianity. Some maintain that such a person is a disbeliever with no need to discuss his reasons for wearing it. Others maintain that such a person should not be judged a disbeliever until he has been discussed and it has been made clear to him that wearing a cross is Haraam for a Muslim and that it is a symbol of Christianity. If he still insists on wearing it, he will be regarded as a disbeliever.
Answer: This matter and the like must be detailed and made clear. This person should be informed of the ruling on wearing the cross and that it is a symbol of Christianity. Moreover, he should be informed that wearing a cross is an indication of being satisfied with and belonging to the Christians and their beliefs… read more here.