Did Paul Steal the Gospel?

What Scriptures do you recommend sharing during a prayer march at an abortion clinic? Can you help me with 2 Peter 2 regarding eternal security? A podcaster is claiming that Paul was a liar who stole Christianity to distort it. Is there biblical evidence to refute this?

Tags: 2 Peter 2, 2 Peter 3:16, abortion clinic, Acts 15, eternal security, Galatians 1, Paul, podcaster, prayer march, Scripture, stole christianity