Everything will be wrong because by “birth” believers and unbelievers have nothing in common.

“Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness? What harmony is there between Christ and Belial? Or what does a believer have in common with an unbeliever? What agreement is there between the temple of God and idols? For we are the temple of the living God. . . ” (2 Cor 6:14-16a) ///