You can’t, as the Catechism says:
161 Believing in Jesus Christ and in the One who sent him for our salvation is necessary for obtaining that salvation.42 "Since “without faith it is impossible to please [God]” and to attain to the fellowship of his sons, therefore without faith no one has ever attained justification, nor will anyone obtain eternal life ‘But he who endures to the end.’"43
What we do acknowledge is right there in what you quoted: “God can lead those who, through no fault of their own, are ignorant of the Gospel, to that faith without which it is impossible to please him.” That faith, without which it is impossible to please Him, is faith in Christ.
Here is how St. Robert Bellarmine explained how following an upright conscience with the aid of grace can lead to this faith (he is countering certain Protestants who said that the existence of non-Christians means Christ does not offer salvation to all):
St. Robert Bellarmine, De Gratis et Libero Arbitrio, lib. 2, cap. 8
This argument only proves that not all people receive the help they need to believe and be converted immediately. It does not, however, prove that some people are deprived, absolutely speaking, of sufficient help for salvation. For the pagans to whom the Gospel has not yet been preached, can know from His creatures that God exists; then they can be stimulated by God, through His preventing grace, to believe in God, that He exists and that He is the rewarder of those who seek Him: and from such faith, they can be inspired, under the guidance and help of God, to pray and give alms and in this way obtain from God a still greater light of faith, which God will communicate to them, either by Himself or through angels or through men.
Pope Francis teaches the same thing in his first encyclical:
Because faith is a way, it also has to do with the lives of those men and women who, though not believers, nonetheless desire to believe and continue to seek. To the extent that they are sincerely open to love and set out with whatever light they can find, they are already, even without knowing it, on the path leading to faith…Any-one who sets off on the path of doing good to others is already drawing near to God, is already sustained by his help, for it is characteristic of the divine light to brighten our eyes whenever we walk towards the fullness of love.