No amount of debate could convince a sceptic of the existence of Hell, just as it couldn't alter a true believer's resolute faith.
Doom Classic fortifies such partisanship by delivering a superb port of the definitive first-person shooter complete with an array of control options. Faithful followers are unlikely to be deterred, however, by the absence of a couple features that makes it less attractive to anyone not as devout.
It's kill or be killed in Doom Classic. As a Marine stationed at the Union Aerospace Corporation's Martian outpost, you're the lone survivor following the opening of a portal to Satan's domain. With all manner of monsters and hellish creatures flooding the facility, it's a fight for survival.