John 3:18

ὁ πιστεύων εἰς αὐτὸν οὐ κρίνεται· ὁ μὴ πιστεύων ἤδη κέκριται, ὅτι μὴ πεπίστευκεν εἰς τὸ ὄνομα τοῦ μονογενοῦς υἱοῦ τοῦ θεοῦ.

Rough Word-by-word:
The one believing into him not is being judged; the not one believing already has been judged, because not he has believed into the name the only born son the of God.

Smooth Translation:
The one believing in him is not being judged; the one not believing has already been judged, because he has not believed in the name of the only born son of God.

Notes:
Notice the passives and the perfects in this verse and "faith" as a verb...
Judgment is passive while belief or faith is active.
There are "believers," "not believers," and those who "have not believed."
There are "those not being judged" and "those who have already been judged."

Judgment is already determined for those who have determined to not believe, but there is an active ongoing negation of judgment for those who believe.

ὁ definite article nominative masculine singular "the"

πιστεύων present active participle nominative masculine singular from πιστεύω (I believe) "one believing"

εἰς accusative preposition "into/unto"

αὐτὸν pronoun accusative masculine singular "him"

οὐ adverb of negation "not"

κρίνεται verb present passive indicative 3rd singular from κρίνω (I judge) "is being judged"

ὁ definite article nominative masculine singular "the"

μὴ adverb of negation "not"

πιστεύων present active participle nominative masculine singular from πιστεύω (I believe) "one believing"

ἤδη adverb "already"

κέκριται perfect passive indicative 3rd singular from κρίνω (I judge) "he has been judged"

ὅτι conjunction "because"

μὴ adverb of negation "not"

πεπίστευκεν verb perfect active indicative 3rd singular from πιστεύω (I believe) "he has believed"

εἰς accusative preposition "into/unto"

τὸ definite article accusative neuter singular "the"

ὄνομα noun accusative neuter singular "name"

τοῦ definite article genitive masculine singular "the"

μονογενοῦς adjective genitive masculine singular "only born"

υἱοῦ noun genitive masculine singular "son"

τοῦ definite article genitive masculine singular "the"

θεοῦ proper noun genitive masculine singular "of God"