I think there’s a problem in your definition. Your “Free will is the ability to perform a decision knowing options in a certain situation,” seems rather a general definition of freedom, including choices of the will for either good or evil. The phrase “free will” however, used by human persons created in the image of God, implies more than mere choice. The created will has a purpose, an orientation toward God, toward the good. Man today is born with a will not free but indeed in bondage, such that man is “inclined” toward evil even while desiring good.
The Catechism, following Scripture, says this concerning freedom:
1733 The more one does what is good, the freer one becomes. There is no true freedom except in the service of what is good and just. The choice to disobey and do evil is an abuse of freedom and leads to “the slavery of sin.”<Cf. Rom 6:17>
And more (note please the uses and meanings of “freedom” here - and opposing it, bondage):
1739 Freedom and sin. Man’s freedom is limited and fallible. In fact, man failed. He freely sinned. By refusing God’s plan of love, he deceived himself and became a slave to sin. This first alienation engendered a multitude of others. From its outset, human history attests the wretchedness and oppression born of the human heart in consequence of the abuse of freedom.
1740 Threats to freedom. …
… By deviating from the moral law man violates his own freedom, becomes imprisoned within himself, disrupts neighborly fellowship, and rebels against divine truth.
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.”<Gal 5:1> In him we have communion with the “truth that makes us free.”<Cf. In 8:32> The Holy Spirit has been given to us and, as the Apostle teaches, “Where the Spirit of the Lord is, there is freedom.”<2 Cor 17> Already we glory in the “liberty of the children of God.”<Rom 8:21>
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:
Almighty and merciful God, in your goodness take away from us all that is harmful, so that, made ready both in mind and body, we may freely accomplish your will.
Extrapolating what we can know about freedom as men, and as men (to some extent, here and now) set free in Christ - extrapolating this to God who has freedom in perfection, we see that God is perfectly free to do good, in an infinite “number” of ways.
