In a nutshell, catching or “fishing” people for Christ (Lk 5:10) entails striving to win others to Jesus, that they also may become committed disciples of the One who died for them and was raised again (2 Cor 5:15). This ought to include both Christian doctrine and defense (apologetics).
Can God be surprised? Several “openness” theologians will point to particular passages in Scripture and assert that God can be caught off guard. But is this the most plausible interpretation of such texts? Is it possible for God to know the future — even the future, free decisions of humans?