Even the worst NFL team is stacked top to bottom with grown men who were college stars and are at or near their peak athletic skill. The Jets D-line would blow up every play, and the O-line would open huge, gaping holes. The receivers would devour the CBs they were up against. The score would be something like 56-0.
But at least this is a more reasonable question than whether or not Alabama could compete, which is what you usually see.