Yes, it's that simple.
At the same time, this simple Gospel raises several questions that must be asked and answered in order to understand the nature of salvation, its implications and why it matters. Even though a small child can understand its basic components, the principles can never be fully exhausted, even after decades of diligent study. God extends well beyond the limitations of human intellect, yet anyone can access Him regardless of age, education or cognitive ability.
I want to look at the various aspects of the Gospel, which necessitates examining various doctrines. Some might protest that we should forget about doctrine and "just focus on Jesus." In response, I'd ask how we can do even that without the great doctrines of Scripture that tell us Who Jesus is, what He thinks and how He relates to us. Without these doctrines, He gets treated as a half-fictitious being Who conforms Himself to individual preferences.
Throughout these posts that explore the doctrines implicit in the Gospel, I pray that the Lord will show more liberal readers how and why the Gospel depends on sound doctrine. More importantly, I pray that any readers who haven't yet responded to the Gospel might place their faith in Jesus as they read through this series.
For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek. ~~Romans 1:16 ((ESV)