Can one be saved and not be a member of the Catholic church?
Or is faith in Jesus enough to be saved?
Yes, if several conditions are met. First, he must be truly ignorant of the fact that the Catholic Church is the Church that Jesus founded. Secondly, he must serve the truth (who is Jesus) to the best of his ability. Thirdly, he must truly repent of his sins.
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
Nevertheless, such people, if saved, are saved through the Church, since salvific grace flows through the Church and Its sacraments, particularly the Eucharist, which is a re-presentation of Christ's redeeming death on the Cross.
Or is faith in Jesus enough to be saved?
Actually "faith alone" is not enough, since even the demons believe, as Scripture tells us. If by "faith" you mean what Catholics would refer to as "formed faith," or faith informed by works, then yes, if the previously mentioned conditions were met.