The gospel message is most often communicated through the perspective of grace, but the gospel message is two-sided and in today's church that second side is often neglected.
Yes, the gospel is about grace, but it's also about the wrath and judgment of God.
There was no greater "hellfire" preacher than our Lord and Savior Jesus Christ. No one spoke of hell more than he did.
When we speak of being scared to death or "fearing the Lord" we absolutely should. That fear is about respect and coming humbly in surrender before the sovereign creator of the universe........again, the sovereign, all-powerful, all-knowing creator of the universe.
That same God indwells his body of believers today in the person of the Holy Spirit. We take that for granted as believers when we should be in awe, reverence and trembling. Yet we can't help ourselves, but his grace is sufficient to help us overcome or proclivities for sin. In all God's glory and majesty he still desires to be aligned with us and engage us despite our finitude and what appears as the inconsequential nature of our humanity as compared to the greater scope of the universe.
As compared to God we're nothing and as compared to the totality of his universe we're barely a fractional portion of it....so small that the math behind that positioning is staggering. Yet, we're deemed worthy by him and made right through him.