Whether a vow is an act of latria or religion?

Objections

Objection 1 : It would seem that a vow is not an act of latria or religion. Every act of virtue is matter for a vow. Now it would seem to pertain to the same virtue to promise a thing and to do it. Therefore a vow pertains to any virtue and not to religion especially.
Objection 2 : Further, according to Tully (De Invent. ii, 53) it belongs to religion to offer God worship and ceremonial rites. But he who takes a vow does not yet offer something to God, but only promises it. Therefore, a vow is not an act of religion.
Objection 3 : Further, religious worship should be offered to none but God. But a vow is made not only to God, but also to the saints and to one's superiors, to whom religious vow obedience when they make their profession. Therefore, a vow is not an act of religion.