The distinction is this, Rome claims you must be a card carrying member of that particular faith group to be saved.
Jesus states you must believe in him to be saved, not an institution.
If Jesus is who he claimed to be, we as his followers are obligated to follow his teachings.
Post #62 in this thread quotes:
847 This affirmation is not aimed at those who, through no fault of their own, do not know Christ and his Church:Those who, through no fault of their own, do not know the Gospel of Christ or his Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do his will as they know it through the dictates of their conscience - those too may achieve eternal salvation.337