Answer:
No, this is not correct. The word "vow" is a singular noun, and you can speak of making "a vow" (it's like a pledge or a promise). There is a word "avowed" but it's an adjective, and it means someone who declares a certain belief openly. So, you make "a vow" (it's two words) to be an honest person. And someone can say they are an "avowed" (one word) atheist.