Could you help me with that?
This seems difficult. Would you say that he or she is a disciple?It would seem that would make the difference in this. Here are some postive insights:
You may of heard this scripture from Romans 10, “For if thou confess with thy mouth the Lord Jesus, and believe in thy heart that God raised him up from the dead, thou shalt be saved. For, with the heart, we believe unto justice; but, with the mouth, confession is made unto salvation.” (Rom 10:9,10) Let’s look into the Catholic insight into this scripture with the greatest catholic teacher, St. Thomas Aquinas (click here to see why he is the greatest
vatican.va/roman_curia/pontifical_academies/san-tommaso/pastmagisterium.html)
In S. Thomas’s commentary of Romans, we read, “Three kinds of confession are necessary for salvaton. First, the confession of one’s own inquity: 'I said, ‘I will confess my transgressions to the Lord’ (Ps 32:5), which is the confession of the repentant. The second is that by which a man confesses the goodness of God mercifully bestowing his benefits: ‘Sing to the Lord a new song, for he has done marvelous things’ (Ps 98:11) and this is the confession of one giving thanks. The third is the confession of divine truth: ‘Everyone who confesses me before men, I will also confess before my Father who is in heaven’ (Mt 10:32) and this is the confession of the believer, about which the Apostle is now speaking. This confession is necessary for salvation, depending on circumstances of place and time, namely when one’s faith is demanded, namely, by a persecutor of the faith, as when the faith is endangered by alien [belief]…What is said about confessing the faith applies to all virtuous acts necessary for salvation according to circumstances of time and place. For the precepts commanding the performance of these acts oblige us always but not for every moment of the day.”(Com. Rom, n. 832)
catenas.wetpaint.com/page/Chapter+10
To speak about the three things that S. Thomas speaks of when we hear confession for salvation could be reiterated to the person you are struggling with. This way you do not drive the person to despair but to hope.
For further help read this by St. Josemaria
escrivaworks.org/book/christ_is_passing_by/point/134 I believe it to be a good introduction the Catholic faith, to those who need a re-awakening.