When the church baptizes an individual, it is an acknowledgment that the church accepts the ________ of the individual concerning his salvation.

The correct answer is "Testimony," as it encapsulates the process by which an individual shares their personal experiences and beliefs regarding their faith and salvation. When a church baptizes someone, it signifies that the church recognizes and affirms the individual's declaration of faith—often referred to as their testimony. This testimony usually includes their understanding of salvation, their repentance, and their acceptance of Jesus Christ as Lord and Savior.

This public declaration is an important part of the baptismal procedure, illustrating that the individual has made a conscious decision to follow Christ and is willing to share this transformation with the community. Through baptism, not only does the individual demonstrate their beliefs, but the church also expresses its acceptance of that testimony as a valid expression of faith in the context of the Christian community.

Other options may relate to aspects of faith or actions taken, but "Testimony" specifically addresses the individual's spoken or shared account of their journey to salvation and their belief system. This distinct focus on the personal experience and expression of faith is what solidifies the connection between the baptism and the individual's testimony.