John states that Jesus Christ is the only true God (see John 1:1, 18; 20:28; Romans 9:5; Titus 2:13; 2 Peter 1:1).
we are in Him: Having fellowship or being united with Jesus Christ means having eternal life, because he is eternal life (see 1 John 5:12; John 1:4; 3:16; 14:6; 20:31).