The Deity of Christ is not RCC, but biblical (so is the trinity). They happen to be right on this and the virgin conception and the resurrection of Christ (are you saying resurrection is RCC, not biblical?!).
False religions can have adherents who do good works and live good lives. This is not the gospel. Rejecting the real Jesus for a counterfeit (mutually exclusive, diametrically opposed views are not equally true, salvific) cannot and will not save (Gal. 1:6-9; Jude 3; 2 Cor. 11:4; Jn. 14:6; Acts 4:12; Rom. 10:9-10; I Jn. 5:11-13).
Blurring the distinction between biblical, historical, orthodox Christianity and false religions (Islam denies the Deity, death, resurrection of Christ-gospel) and pseudo-Christian cults (JW, Mormon, Unitarian, Scientology, Christian Science, Jim Jones, David Koresh, Moonies, etc.) is post-modern relativism, not the gospel.