Short answer is, no.
ShapeShift has a very strict no fiat policy and will never allow users to purchase the cryptocurrencies we support with fiat currencies of any kind or with debit, credit card, etc.
Users can only purchase bitcoin and all of the other altcoins we support with altcoins or bitcoin.
Want to see how our service works? Check out the introduction video that walks you through this process: https://shapeshift.io/new.html