Raised in Wrightsville Beach, North Carolina, Christian Sineath has been performing since the eighth grade, when she was cast as a singing and dancing moth in Babes in Toyland.  She continued performing in regional and community theatre throughout high school, and then completed degrees in Music Performance and English at Peace College in Raleigh, North Carolina. During her undergraduate studies with James Smith, she was a frequent 1st and 2nd place winner in the regional and state level NATS competitions in both the classical and musical theatre categories. She was also a member of the Janiec Opera Company at Brevard Music Center.

After graduation, Ms. Sineath moved to New York City, performing professionally in oratorio, musical theatre, and theatre productions. She continued her studies in Lucca, Italy with Cincinnati Conservatory of Music's Opera Studio program. She was accepted into the prestigious Manhattan School of Music and fulfilled her graduate degree in Classical Voice.  Her performances at MSM included operas, touring outreach operas for children, cabarets, master classes, and concerts featuring contemporary opera and Russian art song.  La Lingua della Lirica in Novafeltria, Italy invited her to perform concerts throughout the Emilia-Romagna region while attending intensive coachings in Italian language, diction, and acting.

She joined Dicapo Opera as a Resident Artist, performing the role of Clorinda in La Cenerentola, the cover of Rosabella in The Most Happy Fella and in the chorus' of Tosca, Iolanta, The Most Happy Fella and La Traviata. After a glowing review in The New York Times, The Most Happy Fella was remounted and recast for a limited return engagement and Christian performed the lead role of Rosabella for multiple performances and was reviewed by Classical Source.  Additional Resident Artist roles include the main stage productions of Puccini's Passion, which include excerpts of Anna in Le Villi, Musetta in La Bohème, Lauretta in Gianni Schicchi, and Lisette in La Rondine, Constanze Weber in the world premiere of Marrying Mozart (co-produced by Opera Moderne),  and Giannetta in L'elisir d'amore. The National Lyric Opera featured her as a soloist in the orchestral concert "Italian Opera's Greatest Moments" and she performed in the chorus in their production of Pagliacci in April. The following summer, she sang the role of Brigitta in Tchaikovsky's Iolanta with Opera Slavica in New York City; she was also featured in their Russian Opera Scenes Concert. 

Christian was cast in Oscar nominee James Spione's film, Silenced, where she portrayed Jesselyn Radack, an ethics advisor for the US Department of Justice who exposed illegal FBI practices during the 2001 invasion of Afghanistan.  Other performances included a cabaret at 54 Below with the cast of Broadway's Kinky Boots, a Master Class and solo recital at Berry College in Georgia, and a orchestral soloist feature at First Presbyterian Church in North Carolina.

 Her most performances included a musical tribute to producer Hal Prince as part of The Actors Fund Gala, which also honored Danny DeVito and Sally Field, and several private events as a soloist. In September of 2017 she performed the role of Susan in Sondheim's Company  in New York City.

Ms. Sineath studies voice with Mike Ruckles and acting with Patrick Page in New York City and is represented by manager Kathy Olsen at Encompass Arts.  Her other interests include cooking, fine art, literature, and fitness and nutrition.