He is known for his finger playing style and jazz-like bass parts, which can be heard on Testament songs such as "Souls of Black" and "Disciples of the Watch", although he has also occasionally been seen using a guitar pick.

Prior the release of their debut album The Legacy, Christian auditioned for Metallica as the replacement for Cliff Burton,[2] but lost to former Flotsam and Jetsam bassist Jason Newsted.

He recorded eight of the band's albums, including The Legacy (1987), The New Order (1988), Practice What You Preach (1989), Souls of Black (1990), The Ritual (1992), Low (1994), The Formation of Damnation (2008), and Dark Roots of Earth (2012).

Christian left due to lack of band financial transparency and inequitable payments by controlling members of Testament, Chuck Billy and Eric Peterson.

In a press release announcing a new album, the band said "both parties came to a mutual decision" and wished Christian well in his future musical endeavors.