In the very first place, the term Christian must be characterized. A "Christian" isn't a man who has said a supplication or strolled down a walkway or been brought up in a piece of the Christian experience; they are not what makes a Christian.
A Christian is a man who has wholly confided in Jesus Christ as the central Savior and in this manner has the Holy Spirit - For God so adored the world, that he gave his exclusive Son, that whoever has confidence in him ought not to die but instead have an everlasting good life. So a Christian can lose salvation by commiting sins against God and not repenting.