HD, The word "vow" has a certain connotation which, regarding religious beliefs, seems negative. My recollection is that the baptismal certificate given in the mid 80s didn't even have the word "vow" on it. Perhaps they differed from place to place. An affirmation of belief is not a vow. RCs entering religious orders take "vows." Traditionally, poverty, chastity, and obedience were among those vows. My personal opinion is that religious vows are a form of legalism, an extreme form. People who take vows are binding themselves to a human construct, something they might imagine will make them better in God's sight. Actually, vows might make a person worse.
If I affirm the belief that Jesus died for my sins and rose again, that's not a vow, which dictionaries define as a "solemn pledge." It's a confession of faith.