This provides the initial definition of ‘believe’ by equating it with ‘receive.’ When we accept a gift, whether tangible or intangible, we thereby demonstrate our confidence in its reality and trustworthiness. We make it part of our own possessions. By being so received, Jesus gives to those who receive him a right to membership in the family of God.
‘Become’ indicates clearly that people are not the spiritual children of God by natural birth, for we cannot become what we already are. This verb implies a change of nature. The word children (tekna) is parallel to the Scottish bairns– “born ones.” It emphasizes the vital origin and is used as a term of endearment (cf. Luke 15:31). Believers are God’s ‘little ones,’ related to him by birth.” (The Expositor’s Bible Commentary, ed. Frank E. Gaebelein, pg. 32)
The implications are obvious. The new birth is received by faith and we become God’s children through faith. John 1:12 simply cannot be made to comport with the Calvinist claim that regeneration precedes faith. Indeed, it proves that contention false.