What you "see fire/Godfire as" unfortunately is not spelled out in Mk 9:49. And it certainly has nothing to do with purifying anything
The early church believed that God's fire is "wise" in purifying us however much we may have messed up during our lives. It burns our delusions away until we see and receive the light and love of Christ. God's fire is "wise" in that it cleanses us from all the false identities we may have accumulated in our lifetimes. The "wood, hay and stubble" of these false identities are burned off but we ourselves "will be saved, but only as through fire."
the work of each builder will become visible, for the Day will disclose it, because it will be revealed with fire, and the fire will test what sort of work each has done. If what has been built on the foundation survives, the builder will receive a reward. If the work is burned up, the builder will suffer loss; the builder will be saved, but only as through fire.
1 Corinthians 3:13-15.
Here's Clement of Alexandria on the subject of God's fire being "wise" which I'm confident will convince you:
“Fire is conceived of as a beneficent and strong power, destroying what is base, preserving what is good; therefore this fire is called 'wise' by the Prophets … We say that the fire purifies not the flesh but sinful souls, not an all-devouring vulgar [earthly, natural] fire, but the 'wise fire' as we call it, the fire that 'pierceth the soul' which passes through it.” - Stromata VII, 2:5-12, Clement of Alexandria.
Hell, then, was seen as a tough but redemptive journey to repentance and restoration. It was still seen as unimaginably painful, just not eternal.