A believer can become an 
unbeliever.
				 
				If an unbeliever can 
become a believer then why can’t a believer become an unbeliever?  He/she can 
and the Bible shows this.
				 
				“Some shall depart from 
the faith” (1 Tim. 
4:1). A child of God can deny the faith and become “worse than an infidel” (1 
Tim. 5:8).  Can one who is worse than an infidel enter heaven?  False 
teachers can “overthrow (destroy) the faith of some” (2 
Tim. 2:18); and “some…have made shipwreck” of their faith (1 
Tim. 1:19)
				 
				“Take heed, brethren, lest there be in any 
of you an evil heart of unbelief, in departing from the living God” (Heb. 
3:12).  This warning was given to brethren (“holy brethren, partakers of the 
heavenly calling,” (Heb. 
3:1), undeniably children of God), “lest there be in any of you….” Children 
of God – believers – can become unbelievers and depart from God.  Can one go to 
heaven with “an evil heart of unbelief” (cf.
				Heb. 11:6;
				Rev. 21:8)?