Meryl Streep is voicing Aslan in Greta Gerwig's adaptation of The Magician's Nephew. Evangelical commentators have responded with predictable fury at the gender-swap of Lewis's theological lion. The immediate read from mainstream outlets is proportional: a minor creative choice generating disproportionate outrage. But this frame misses something more telling about how adaptation works as a tool for erosion.
When the BBC adapted The Magician's Nephew in 1988, it softened Lewis's explicit Christian allegory after religious consultants objected to how directly the magic-as-temptation sequence paralleled the Fall of Eden. The filmmakers didn't remove the scene. They drained it of theological weight, making the transgression feel cosmically important rather than spiritually legible. This established a template: each subsequent adaptation preemptively diluted specificity to avoid religious objection.
The Prince Caspian BBC serial toned down Aslan's explicitly messianic language. The Walden Films trilogy in the 1980s softened the talking animals' moral agency to make them feel less like allegories and more like characters. By the time you reach Andrew Adamson's 2005 The Lion, the Witch and the Wardrobe, Aslan has become something closer to a magical facilitator than a theological figure. Powerful, but theologically opaque.
Each filmmakers' capitulation established the ground where Gerwig's choice could look simultaneously radical and inevitable. The gender recast appears novel because decades of prior adaptations already removed the theological specificity that made gender materially significant to Lewis's concept. If Aslan is no longer unmistakably a theological figure, his gender becomes a character design choice rather than a doctrinal question.
The evangelical anger is not disproportionate. It is precisely calibrated to what they sense: that the conversation about Narnia stopped being about Lewis's actual ideas somewhere in the 1990s, and they are objecting to a process that finished decades ago. They read the gender change correctly as the logical endpoint of a template that never asked permission to begin. The real mistake was not Gerwig's choice, but the accumulated small surrenders that made it feel like one.