Or, we could just believe in what we are supposed to focus on, how Christ died for all, and rose again.
That means we were aware of Jesus Christ in the flesh, but now can only know Him as risen, because if we focus on Christ or anyone in the flesh, then we are yet in the flesh and not in the Spirit.
But if we only know Christ after the Spirit now, then we are in the same Spirit.
Is that all we're supposed to "focus on"? Which Christ do you believe in--the one that is only divine, the one that is only human, the one that is both, the one that is just a mode of the Father, the one that became the Son at the Incarnation, or the one who has eternally been the Son?
With Jesus being the central figure of all of Scripture, in whose name alone we have salvation, based on his death and resurrection, do you think we can just believe whatever we want about Jesus and still be saved? If Jesus was a mere creature only, do think the sacrifice was sufficient for the salvation of all throughout history?
Jesus himself said:
Joh 8:23 And He was saying to them, "You are from below, I am from above; you are of this world, I am not of this world.
Joh 8:24 "Therefore I said to you that you will die in your sins; for
unless you believe that I am He,
you will die in your sins." (NASB)
Note that "
He" is italicized because it isn't in the Greek. Just a little bit later, Jesus says:
Joh 8:58 Jesus said to them, "Truly, truly, I say to you, before Abraham was born,
I am." (NASB)
He also said:
Joh 3:18 Whoever believes in him is not condemned, but whoever does not believe is condemned already, because
he has not believed in the name of the only Son of God. (ESV)
To believe "in the name" is to believe in the "sum of the qualities which mark the nature or character of a person" (M. R. Vincent).
John has already mentioned similar in his prologue:
Joh 1:12 But to all who did receive him, who believed in his name, he gave the right to become children of God, (ESV)
Notice that those who received Christ are those "who believed in his name," and it is those alone who are the "children of God."