Be found in him (heurethō en autōi). First aorist (effective) passive subjunctive with hina of heuriskō. At death (2Co 5:3) or when Christ comes. Cf. Phi 2:8; Gal 2:17.
Through faith in Christ (dia pisteōs Christou). The objective genitive Christou, not subjective, as in Gal 2:16, Gal 2:20; Rom 3:22. Explained further by epi tēi pistei (on the basis of faith) as in Act 3:16.