Scientific naturalism is the view that “the physical cosmos science studies is all that exists” (cf. J.P. Moreland). This worldview assumes that only material stuff exists (e.g., physics and chemistry) and that science is the only source of knowledge concerning the world; everything else is mere conjecture. The implication of this view is that there can be no human soul or immaterial objects/persons like angels or God. The supernatural is excluded by definition. Plainly stated: there is no spiritual reality in this world or the next. The grave is all there is.
This is a major worldview in America today. In order to be a good ambassador for Jesus Christ, we must understand the worldviews that are vying for the hearts and minds of this generation.