Most Trinitarian Christians think Jesus was the Son of God, who always existed as God, the Second Person of the Trinity, but …
“In the beginning was the Word (the Logos), and the Word was with God, and the Word was God. … And the Word became flesh (Jesus) and dwelt among us” (John 1:1,14)
“… and His (Jesus’) name is called The Word of God.” (Revelation 19:13)
Technically, Jesus Christ did NOT exist before the Word (the Logos) came to earth. Jesus (as man) had a beginning, while Jesus (as God) did not. The Word (the Logos) was the One who always existed, not Jesus Christ.
From the Scriptures, we believe this Jesus was both God and man: “fully God and fully man”.
“And behold, you (Mary) will conceive in your womb and bring forth a Son, and shall call His name JESUS. … The Holy Spirit will come upon you, and the power of the Highest will overshadow you; therefore, also, that Holy One who is to be born will be called the Son of God.” (Luke 1:31-35)
Gabriel said to CALL the new baby “Jesus” and to CALL Him “the Son of God”. Gabriel did NOT say He WAS “Jesus” and “the Son of God”. IMO, no one called “the Son of God” existed before the Word (the Logos) came to earth.
But, Jesus truly was the Son of God because His “father” was God the Holy Spirit (Luke 1:35).
“And behold, you (Mary) will conceive in your womb and bring forth a Son” (Luke 1:31)
“… do not be afraid to take to you (Joseph) Mary your wife,
for that which is conceived in her is of the Holy Spirit.” (Matthew 1:20-21)
This sounds like a normal conception … so IMO, the Holy Spirit planted a male sperm next to Mary’s ovum, so a normal conception could take place. (This is preferable to thinking the Holy Spirit performed a whole-fetus “creative” miracle.)
Now for the upsetting part for many (but it shouldn’t be) …
The reason for God NOT allowing Joseph to be Jesus’ biological father was so his inherited sin nature would NOT be passed on to Jesus.
Joseph and Mary both carried man’s inherited sin nature, so IMO, man’s sperm carries the sin nature, and not the blood (proof: Mary’s involvement).
This sacrificial Lamb of God had to be absolute perfection in every detail. Jesus was the ultimate, final, and perfect blood Sacrifice … the sacrificial Lamb of God. God being sacrificed to God makes the Almighty’s ingenious plan even more awesome!