The ONLY thing that assures our salvation is Christian Baptism:
False. The quote from the CCC is regarding the Grace of Baptism, not Salvaiton. Baptism does assure Salvation, but it is not to be understood that Baptism
alone does so. From the CCC:
1127 Celebrated worthily in faith, the sacraments confer the grace that they signify.48 They are efficacious because in them Christ himself is at work: it is he who baptizes, he who acts in his sacraments in order to communicate the grace that each sacrament signifies. the Father always hears the prayer of his Son’s Church which, in the epiclesis of each sacrament, expresses her faith in the power of the Spirit. As fire transforms into itself everything it touches, so the Holy Spirit transforms into the divine life whatever is subjected to his power.
1128 This is the meaning of the Church’s affirmation49 that the **sacraments **act ex opere operato (literally: “by the very fact of the action’s being performed”), i.e., by virtue of the saving work of Christ, accomplished once for all. It follows that "the sacrament is not wrought by the righteousness of either the celebrant or the recipient, but by the power of God."50 From the moment that a sacrament is celebrated in accordance with the intention of the Church, the power of Christ and his Spirit acts in and through it, independently of the personal holiness of the minister. Nevertheless, the fruits of the sacraments also depend on the disposition of the one who receives them.
1129 The Church affirms that for believers the sacraments of the New Covenant are necessary for salvation.51 “Sacramental grace” is the grace of the Holy Spirit, given by Christ and proper to each sacrament. the Spirit heals and transforms those who receive him by conforming them to the Son of God. the fruit of the sacramental life is that the Spirit of adoption makes the faithful partakers in the divine nature52 by uniting them in a living union with the only Son, the Savior.
The CCC is clear here that all of the Sacraments are necessary for Salvation. Baptism is the
primary Sacrament in that
through it we gain access to the merits and graces of the rest.
Let’s be very clear here. The graces of Christ’s sacrifice, and the life of the Holy Spirit are what save.
Baptism is the most fundamental, basic, and necessary Sacrament to receive Salvation, but for those who live long after Baptism, it’s the other Sacraments that bring salvation.
But we are NOT compelled to seek out such situations. We are not obligated, for example, to work in a soup kitchen as a condition of our salvation. If we are confronted with a legitimate situation of need, and are able to respond but do not, for selfish reasons, this constitutes sin (and, given sufficient knowledge and intent, a mortal sin).
But there is NO SUCH THING in Catholic theology as a general obligation of any kind to do good works as a condition of salvation.
From the CCC:
GOD’S SALVATION: LAW AND GRACE
1949 Called to beatitude but wounded by sin, man stands in need of salvation from God. Divine help comes to him in Christ through the law that guides him and the grace that sustains him:
Work out your own salvation with fear and trembling; for God is at work in you, both to will and to work for his good pleasure.1
True,
our own works do not merit salvation. However, through the Sacraments we are united to Christ and receive the Holy Spirit. And it is
in this state of union with Christ, and enlivened by the Holy Spirit whereby our works have merit because they are not our works but Christ’s through us.
II. Human Freedom in the Economy of Salvation
1741 Liberation and salvation. By his glorious Cross Christ has won salvation for all men. He redeemed them from the sin that held them in bondage. "For freedom Christ has set us free."34 In him we have communion with the "truth that makes us free."35 The Holy Spirit has been given to us and, as the Apostle teaches, "Where the Spirit of the Lord is, there is freedom."36 Already we glory in the "liberty of the children of God."37
1742 Freedom and grace. the grace of Christ is not in the slightest way a rival of our freedom when this freedom accords with the sense of the true and the good that God has put in the human heart. On the contrary, as Christian experience attests especially in prayer, the more docile we are to the promptings of grace, the more we grow in inner freedom and confidence during trials, such as those we face in the pressures and constraints of the outer world. By the working of grace the Holy Spirit educates us in spiritual freedom in order to make us free collaborators in his work in the Church and in the world:
When we unite ourselves to the saving action of Christ on the cross, we receive the Holy Spirit and become free, and the Holy Spirit working in us, teaches us spiritual freedom * in order to make us free collaborators in his work in the Church and in the world*.
Here, you see that salvation isn’t for ourselves. It’s to free us to be “free collaborators” with God’s own work both in His Church (the already Baptised) and in the world (the unBaptised). This is why Faith without works is dead, because Faith is
for works.
There is a real problem with thinking that the Christian only has to “respond” to immediate needs. This kind of thinking doesn’t understand the meaning and purpose of Salvation. It doesn’t link the doctrine of Salvation with Christ’s exhortation to “clothe the naked, feed the hungry, etc.” “Love one another, as I have loved you.” Did Christ go out of His way to “seek out such situations” as you put it? He most certainly did. He incarnated for exactly that reason; to help the helpless.