The passages you listed (Rom 11:22, 1 Cor 15:2, Col 1:22–23, 2 Thes 1:4–5, 2 Tim 2:12, Heb 3:6,14, Heb 10:35–36, James 1:12, 2 Pet 1:10–11; 2:20, 1 John 2:24–25 & Rev 2:10) are not teaching that obedience or perseverance maintain salvation. They are warning against the one thing that actually...