"He staggered not at the promise of God through unbelief" (Romans 4:20) sounds like Abraham physically stumbled or tripped.

Modern translations render this "he did not waver through unbelief": the whole point of the verse is that Abraham, despite his and Sarah's age, didn't let doubt shake his confidence in God's promise.

"Stagger" in 1611 English already carried this figurative sense of wavering or hesitating in judgment or belief, not just the physical sense of an unsteady walk. The physical sense survived into modern English; the figurative one mostly didn't, which is why "staggered" here reads oddly today.