Complex sentence: This suggests that baptism is only a mature response to eternal life, and that infants generate their inner response to God's presence, i.e. those who warm to him would, if dying in infancy, be with him eternally; contra-wise those who chilled to him.
Split into simpler sentences: This suggests that baptism is only a mature response to eternal life, and that infants generate their inner response to God's presence. Ie those who warm to him would, if dying in infancy, be with him eternally; contra-wise those who chilled to him.