I am a Christian because there is no other name given whereby we might be saved save for the name of Jesus Christ. However, not all that call themselves Christian are. I believe we have to really know who Jesus is to be saved. Many know about Jesus, but don't know Him. Additionally, many religions that are mutually exculsive from eachother claim to have a witness of some spiritual significant thing in their life, but that is not really a confirmation that they are in the faith. Satan can appear as an angel of light and deceive many. If he can do that, then it shouldn't surprise anyone that his children can appear as ministers of righteousness, but they are wolves in sheeps clothing whether they realize it or not.