I know I said that I wouldn't post any more on the subject of Jesus' pre-existence before his birth as a human, but I thought I should just correct you on your comment that 1 Corinhians 8:6 is "speaking of the Church". The context of the passage (the whole chapter) is actually about Christians eating food offered to idols. Paul says that though there are many things called gods, we know that there is just one true God, and that everything that exists was made because it was His will that it should be created, and He chose that everything, including us humans, should be created by His beloved only begotten Son Jesus. Therefore whether we eat food offered to idols or not, it will not affect our relationship with God, for we know as God knows that the idols are not true gods. But Paul advises to be careful and consider those weaker Christians that have just converted from their pagan idol worshipping beliefs, that the stronger Christians should not therefore eat food prepared for idols if it might cause those new Christians to fall back into their pagan beliefs. The "are all things" is therefore referring to exactly what it says - everything that has been made. The verse is about God and Jesus, not the Church. As the ISV translates it:
(6) yet for us there is only one God, the Father, from whom everything came into being and for whom we live. And there is only one Lord, Jesus the Messiah, through whom everything came into being and through whom we live.
or the TLV:
(6) yet for us there is one God, the Father, from whom are all things, and we exist for Him; and one Lord, Yeshua the Messiah, through whom are all things, and we exist through Him.
1 Corinthians 8:4-13 (WEB):
(4) Therefore concerning the eating of things sacrificed to idols, we know that no idol is anything in the world, and that there is no other God but one.
(5) For though there are things that are called “gods”, whether in the heavens or on earth; as there are many “gods” and many “lords”;
(6) yet to us there is one God, the Father, of whom are all things, and we for him; and one Lord, Jesus Christ, through whom are all things, and we live through him.
(7) However, that knowledge isn’t in all men. But some, with consciousness of the idol until now, eat as of a thing sacrificed to an idol, and their conscience, being weak, is defiled.
(8) But food will not commend us to God. For neither, if we don’t eat, are we the worse; nor, if we eat, are we the better.
(9) But be careful that by no means does this liberty of yours become a stumbling block to the weak.
(10) For if anyone sees you who have knowledge sitting in an idol temple, will not the weak one's conscience be lifted up so as to eat things sacrificed to idols?
(11) And on your knowledge the weak brother will fall, he for whom Christ died.
(12) And sinning in this way against your brothers, and wounding their conscience, being weak, you sin against Christ.
(13) Therefore, if food offends my brother, I will eat no flesh forever, that I do not offend my brother.
This is also in line with what Paul wrote earlier, when he said that what we eat is a trifling matter, 1 Corinthians 6:12-13 (WEB):
(12) “All things are lawful for me,” but not all things are expedient. “All things are lawful for me,” but I will not be brought under the power of anything.
(13) “Foods for the belly, and the belly for foods,” but God will bring to nothing both it and them. But the body is not for sexual immorality, but for the Lord; and the Lord for the body.