The insurance money was a factor for Teresa, but by walking away from the church, Randy took her farther away from David.

She no longer would work in the church kitchen, attend choir rehearsals, or other David’s sermons stir the congregation on Sunday mornings.

Randy also knew, or suspected, enough to possibly crash David Love’s future. His financial questions could get David fired from New Hope. And if he acted on suspicions of his wife’s affair, Randy could wreck any hope that David Love would work again as a Baptist pastor.

Whether or not he realized it, Randy Stone had become the greatest threat to David Love’s happiness and livelihood.

Sources: 

Teresa Stone | Murderpedia, the encyclopedia of murderers

Former Marine's Murder Exposes Wife's Affair with Pastor - ABC News (go.com)

https://thecinemaholic.com/randy-stone-murder-where-are-teresa-stone-and-david-love-now/