At best one could argue that there are some who are not materially Catholic while being formally Catholic. While there are problems with that position, to state categorically that non-Catholics can be saved is heresy.
Similarly, to state that people can be saved without or apart from the Sacrament of Baptism is heresy. At best one could argue that people can receive the Sacrament in voto and that the Sacrament, operating through the votum, remains the instrumental cause of justification quasi-ex-opere-operato, vs. the dispositions meriting salvation ex opere operantis (Pelagian heresy).