Sacrifice, exile, and disputes about Christ and Baptism

Unknown artist, the 230s to early 250s, Dura-Europos. A baptistery wall painting, now at Yale.
What Christians faced under Decius and Valerian
Who is Christ, and who is baptized validly?
Regional meetings of bishops that shaped doctrine
Teachers, bishops, and martyrs of the century
Rome, Persia, and the empire around the church
What the Lutheran Confessions teach

What makes a Baptism valid, the minister or Christ’s word and water?