This opinion is from someone who's been in charge of hiring a few times and will likely do so again: If you can actually do the job described, I don't give a damn about your credentials. I would not fire an employee who I found out fabricated credentials, if they had been working well for a while.
Lying about your credentials is really low and kept the more experienced person from getting the job. You may be happy with the liar's output, but you don't know how much you're screwing yourself (and their future employers) in the end by allowing that type of behavior to be rewarded.