The term “Kingdom of Heaven” is exclusively used by Matthew in his Gospel, and “Kingdom of God” is used by all others. This is due to the intended audience, where Matthew was writing largely to the Jews and the others were writing to a more Greek audience. Through a short comparative Bible study, shows that they are indeed identical.
There is no need to differentiate between these two concepts, because the Bible clearly depicts them as the same idea, and their usage can be shown to be synonymous.
Compare the following verses.
- Matthew 3:2 — Mark 1:15
- Matthew 5:3 — Luke 6:20
- Matthew 13:31-33 — Luke 13:18-21
- Matthew 16:28 — Mark 9:1
- Matthew 19:23-24 interchanges them.