Rodney Arnold planted OneLife Church in the Knoxville area in 2009. Started in his living room, the church has since multiplied to multiple campuses across Knoxville and has planted four autonomous churches in East Tennessee while coaching and training hundreds of other church planters as the founding member of the Ignite Church Network. In 2020, OneLife Church was recognized by Outreach magazine as one of the top-100 multiplying churches in the United States.

While serving as a local pastor, Rodney has also been a trainer and speaker across the country including the Church Multiplication Training Center, Ludlow Falls Family Camp, Ignite Network, Building Bridges Network, Exponential conference, Leadership Network, and the SHIFT national conference. Internationally, Arnold has partnered with networks to train pastors and church planters across Latin America, including the Pastor Network Panamá and Love Serves International in the Dominican Republic. He also serves as the Vice-President of the Missionary Church, USA.