Let My People Grow… Grow Up
The meaning of life is responsibility. The purpose of life is settled by God's agenda and the believer's contribution is explicitely defined by the Father. There is no other qualification for God's love, gift of eternal life than what His Son has settled through His incarnation, life and redemptive assignment. However Kingdom-assignments have requirements, not in terms of diplomas and skills, but of personal formation amd spiritual education.
God doesn't reject anybody as a person, but He might do so regarding Kingdom assignments.
Childishness is not cute.