And still no one posted the Greek text of the phrase in question.
ἄξιος εἶ, ὁ κύριος καὶ ὁ θεὸς ἡμῶν,
λαβεῖν τὴν δόξαν καὶ τὴν τιμὴν καὶ τὴν δύναμιν,
ὅτι σὺ ἔκτισας τὰ πάντα
καὶ διὰ τὸ θέλημά σου ἦσαν καὶ ἐκτίσθησαν.
Worthy are you, our Lord and God,
to receive glory and honor and power,
because you created all things
and on account of your will they existed and were created.
046, as Stephen stated, inserts οὐκ before ἦσαν:
καὶ διὰ τὸ θέλημά σου οὐκ ἦσαν καὶ ἐκτίσθησαν
and on account of your will they did not exist and were created
A few (1854, 2050, apparently one manuscript of the Majority text and the Sahidic tradition) have the present εἰσίν instead of imperfect ἦσαν:
καὶ διὰ τὸ θέλημά σού εἰσιν καὶ ἐκτίσθησαν
and on account of your will they exist and were created
There is also one uncial (2329) that replaces ἐκτίσθησαν with ἐγένοντο:
καὶ διὰ τὸ θέλημά σου ἦσαν καὶ ἐγένοντο
and on account of your will they existed and came into being
Still yet, Codex Alexandrinus (A) deletes the last phrase altogether:
καὶ διὰ τὸ θέλημά σου ἦσαν
and on account of your will they existed
This should help sort through the verse's appearance in the major witnesses. There isn't just one variant in the verse.
Jason A. Hare