This essay brings the theology of participation with Christ into contact with Paul’s first-century belief about the spirit-world, both fundamental components of Paul’s thought. By doing so, one can see that participation with Christ, who triumphed over the powers, entails similar spiritual warfare for believers. While Tannehill briefly recognizes this component of participation, and Gombis wrote at a more popular level elaborating thereon, there is a general lacuna for scholarly discussion of participation including spiritual warfare. Despite this lack of focus on spiritual warfare, many of the scholarly conceptions of participation point in the direction of this essay, such as Gorman’s view of participation as the “re-incarnation” of the Christ-story. Second, the Armor of God passage in Ephesians, a book strongly focused on the spirit-world and being in Christ, will be discussed as a case study in which Paul’s spirit-world belief (Geisterglauben) and participation theology come to a climactic crescendo. This passage shows that Christians, like their armored Lord in whom they participate, are to struggle against the forces of wickedness. Finally, canonical observations will be sketched about participation including spiritual warfare, especially in light of Christ’s temptation and considerable exorcism ministry.