How do we know the doctrine of believer's baptism is true?

The doctrine of believer's baptism asserts that baptism should follow an individual's personal faith in Jesus Christ. This teaching finds strong support in the New Testament where instances of baptism are closely tied to the individual's faith — believers were baptized after they professed their belief in the gospel. This practice stands in contrast to infant baptism based on the assumption that physical lineage entitles a child to baptism. Instead, Scripture emphasizes that faith is the essential expression of a spiritual life, and baptism is an act of obedience following one’s faith. Thus, apostolic accounts consistently depict a pattern of belief followed by baptism, reinforcing the necessity of personal faith as the precursor to the act of baptism.