When the Holy Bible refers to Christians as "sons of God", it is not referring to any others, except those of the faithful who are  "in the Spirit", who have the "incessant prayer" in their heart.

"...For those who are led by the Spirit of God, they.... are sons of God... you have received the Spirit of adoption, in which we cry out 'Abba, the Father'.  This is the Spirit that co-testifies with our spirit that we are children of God."  [Romans  8:14-16]

Could this imply that whoever does not speak in tongues is not a Christian?