life of faith; religious life
Refers to a lifestyle centered around religious belief and practice, often used in Christian contexts but applicable to any faith.
彼は毎日の祈りと聖書の勉強を信仰生活の中心にしている。
He makes daily prayer and Bible study the center of his life of faith.
信仰生活を送る上で、教会のコミュニティは大きな支えになる。
In living a religious life, the church community provides great support.
信仰 is the abstract concept of faith or belief, while 信仰生活 specifically refers to the practical, lived experience of that faith.
宗教生活 is a broader term for religious life in general, whereas 信仰生活 emphasizes personal faith and devotion.
Compound of 信仰 (faith, belief) and 生活 (life, living). The exact historical derivation is uncertain, but the term is a straightforward modern combination.