Nah, Viara just doesn't like crazy, tight-pants, religious nutcases who try to convince her that she's constantly wrong.
She doesn't fault anyone for religion just because she has none, but she has no intent on getting religion, either.
Having been familiar with polytheistic religion and the quinari religion growing up, and being exposed to Andrastian sentiments much later, Vi is of the mind that everyone thinks they are unabashedly right, and therefore, that everyone is probably wrong.
Which is probably a little hypocritical of her, but then again... no one's perfect.