Reply Obj. 2: "To think" is not taken here for the act of the
cogitative power, but for an act of the intellect, as explained above.

Reply Obj. 3: The intellect of the believer is determined to one
object, not by the reason, but by the will, wherefore assent is taken
here for an act of the intellect as determined to one object by the
will.
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SECOND ARTICLE [II-II, Q. 2, Art. 2]

Whether the Act of Faith Is Suitably Distinguished As Believing God,
Believing in a God and Believing in God?

Objection 1: It would seem that the act of faith is unsuitably
distinguished as believing God, believing in a God, and believing in
God. For one habit has but one act. Now faith is one habit since it is
one virtue. Therefore it is unreasonable to say that there are three
acts of faith.

Obj. 2: Further, that which is common to all acts of faith should not
be reckoned as a particular kind of act of faith. Now "to believe
God" is common to all acts of faith, since faith is founded on the
First Truth. Therefore it seems unreasonable to distinguish it from
certain other acts of faith.

Obj. 3: Further, that which can be said of unbelievers, cannot be
called an act of faith. Now unbelievers can be said to believe in a
God. Therefore it should not be reckoned an act of faith.