In my book Leading the Presence-Driven Church I argued that the central theme of the Bible is the presence of God. Gordon Fee referred to this as the "presence motif," which runs like a river from Genesis to Revelation.
Tonight I've been reading John Walton's Old Testament Theology for Christians. He affirms the same as Fee, and me. Here's a long quote, making the point.
"I propose that the primary theme that progresses throughout the Old Testament, and indeed throughout the entire Bible, is the establishment of God’s presence among his people (“I will put my dwelling place among you,” e.g., Lev 26:11) with the explicit intention of being in relationship with them/us (“I will . . . be your God, and you will be my people,” e.g., Ex 6:7; Lev 26:12; Jer 11:4; Ezek 36:28). I do not consider this to be the “center” of Old Testament theology, but it is an overarching theme, arguably the most dominant and pervasive of themes, the trajectory along which the program of God moves. It is the covenant that gives formal articulation to the stages of the relationship between God and his people; it is the promise of God that he will make such a relationship possible; it is the Torah that governs how people may live in the presence of God and sustain relationship with him; and it is the kingdom of God that expresses his role in the cosmos and in which we participate as we live out our relationship with him.