My first thing is that a servant is a christian and a beleiver.
Strong's Number: 1401 servant Transliterated: doulos Phonetic: doo'-los
Text: from 1210; a slave (literal or figurative, involuntary or voluntary; frequently, therefore in a qualified sense of subjection or subserviency): --bond(-man), servant.
Strong's Number: 4190 evil Transliterated: poneros Phonetic: pon-ay-ros'
Text: from a derivative of 4192; hurtful, i.e. evil (properly, in effect or influence, and thus differing from 2556, which refers rather to essential character, as well as from 4550, which indicates degeneracy from original virtue); figuratively, calamitous; also (but) ill, i.e. diseased; but especially (morally) culpable, i.e. derelict, vicious, facinorous; neuter (singular) mischief, malice, or (plural) guilt; masculine (singular) the devil, or (plural) sinners: - -bad, evil, grievous, harm, lewd, malicious, wicked(-ness). See also 4191.