I find it helpful to think of the faith of disciples
in terms of what Jesus bought and taught.
We trust that:

By Jesus' atonement we are redeemed into the Way of Blessing leading to heavenly life,
and by Jesus' teaching we see how to walk in the Way during our earthy life.
By Jesus' atonement we obtain a new identity as God's children,
and by Jesus' teaching we understand how to fulfill that identity
to God's glory (John 15:8) and our joy (John 15:11).