(a) How Paul convinced the Galatians that Christians are children of God:
(i) God sent Jesus into the world (through a woman) for the sake of humanity.
(ii) Before the coming of Jesus Christ, man had been under the custodianship of the law.
(iii) But with the arrival of Jesus Christ, through faith in Him, man is justified.
(iv) Baptism in Jesus Christ means putting on Christ (in our lives).
(v) Man, therefore, is no longer under the custodianship of the law.
(vi) He can claim sonship by adoption through faith in Jesus.
(vii) In Christ all believers are one.
(viii) In Christ there is neither Jew nor Gentile etc.
(ix) Sonship is open to everyone.
(x) And if, we are Christians, then we are heirs by promise.
(xi) Believers are no longer subject to the elemental spirits.
(xi) So, the sonship is guaranteed by faith in Jesus Christ.
(xii) Those who reject Jesus Christ are out of Gods' plan.

(b) Manifestations as children of God:
(i) Christians should eschew carnal pleasures.
(ii) They should live Christ-like life.
(iii) Christians should die to sin just as Jesus Christ died for the sin of humanity.
(iv) Christians should evangelise/make saints out of sinners.
(v) Daily spiritual growth by studying the word of God.
(vi) Christians should pray and fast.