The good news comes by our LordJesusChrist who was begotten by His HolySpirit.
The Book of Mark covers the early 1st century, between 10–40 AD, and was likely written between 50–70 AD

Is the Gospel the Gospel of God Rom 1:1 or is it the Gospel of Jesus Christ?
When you understand that Jesus is MightyGod, the incarnation of the HolySpiritFather, you see that there is no conflict.