en_tn/2co/06/14.md

tied together with

"teamed up with" or "have a close relationship with" (See: rc://en/ta/man/translate/figs-idiom)

what share does a believer have with an unbeliever?

Believers do not have the same values as unbelievers. AT: "what values does a believer share with an unbeliever?"

what fellowship does light have with darkness?

Light can not coexist with darkness. When light is present, darkness flees.

with the demon Beliar

"Beliar" is another name for the devil.

Or what share does a believer have together with an unbeliever

Believers and unbelievers have totally different values that they live by and those values oppose each other.

we are the temple of the living God

Paul refers to the all the christians as forming a temple for God to dwell in. AT: "we have the Holy Spirit of God living within us." (See: rc://en/ta/man/translate/figs-metaphor)