A believer takes the high ground in a Win/Win philosophy. The one place a believer cannot go is to Hell. The one place a non-believer cannot go is Heaven. If by any odds the Christian belief was wrong then the believer gets the same afterlife result as any non believing person. The opposite is also true if the Christian belief is right, all non-believers will spend eternity in HELL. Are you really prepared to gamble your eternal life on the losing option?