That all depends on how you (and they) define "The Gospel".
Many are not aware of Colsen's regret and seeking guidance from D. James Kennedy. This discussion by D. James Kennedy, John Ankerburg, John McArthur, and R.C. Sproul is valuable, especially when R.C. gets to the discussion of "Imputation" vs. "Infusion" with regards to the righteousness of Christ and its part in Justification.
Irreconcilable Differences: Catholics, Evangelicals, and the New Quest for Unity, Parts 1-3