[2] Andree Farias of AllMusic said "After surviving two label shutdowns and constant trial-and-error, the powerhouse vocalist finally hit it big with 2005's Awaken, her best-selling fifth studio album.

For the first time, Grant was finally taking the reins of her career, forging a vision of her own, handling a larger share of the songwriting duties, and opting for a more mature, pop/rock-inflected adult contemporary sound.

For a Christian pop diva, she's certainly taking a lot of risks here, parlaying her potent vocals with fierce pop/rock elements, plus the occasional synth effects, urban-pop affectations, and even a horn section or two.

"[1] CCM Magazine's Caroline Lusk claimed "Natalie Grant's latest album, Relentless, is a reminder why she wears the crown of top female vocalist two years running.

With a solid package of truth, soul, incredible musicianship and production that is at times overbearing, but overall, well-balanced, Relentless earns a spot as an important contribution to the musical world and the body of Christ.

"[3] Russ Breimeier of Christianity Today stated "Taking inspiration from stories and testimonies shared through Women of Faith's Revolve Tour for teen girls, Relentless is ever bit as excellent as Awaken, this time focused on finding hope amid life's challenges.

"[4] Cross Rhythms' Esther Jones declared "Despite having been quiet for almost three years, the award-winning singer re-enters the CCM scene with gusto and prowess to deliver her finest ever album.

"[5] Nathaniel Schexnayder of Jesus Freak Hideout remarked "Rather than stick with one or two simple genres, Grant tests her limits as she brings a variety of styles to the playing field, including pop, medium rock, adult contemporary, and even a hint of hip hop on one track.