Are my pistons shot if I suspect gas in my oil?

Sometimes fuel injected engines are easy to flood during severely cold weather. Not having fuel pressure at the rail during cranking may indicate frozen fuel line or filter (due to water), bad fuel pump or bad fuel pump relay. The best way to "unflood" one that has been flooded is to crank the engine with the throttle pedal to the floor. If you hold the pedal to the floor the injectors will not inject fuel. That will do nothing to fix the no fuel pressure issue. Also removing and changing the spark plugs will help a severely flooded engine. You need to get it running and then change the oil and filter.