I think you have a good point, aYs, in as much what God has done for us, and the detail of how it all works, is certainly rather mind boggling - and not understanding everything does not preclude us from salvation.
However, we are to worship God with our
minds and also to be prepared to give aswers to those who ask us about our Faith.
When folk have genuine questions, it is good to be able to provide answers that help steer them toward the truth about God. Good answers that satisfy a seeker's questions and help remove doubts may well lead him to Christ. We need to know for ourselves as well, so we can be good apologists for our beliefs.
C2, the Nicene Creed puts it this way:
{clip} ... We believe in one Lord, Jesus Christ,
the only Son of God,
eternally begotten of the Father,
God from God, Light from Light,
true God from true God,
begotten, not made,
of one Being with the Father.
Through him all things were made.
For us and for our salvation
he came down from heaven:
by the power of the Holy Spirit
he became incarnate from the Virgin Mary,
and was made man.
Source
I think the understanding you seek is that of the
hypostatic union that Byblos mentions.
Here is some more on the subject.
Hope this helps you avoid any bruises!
