Not yet. While Islam is the fastest growing religion in the US, the numbers aren't yet on par with Judaism. Jews are the third largest religious affiliation in the US behind Christianity and atheism/no religion.
As of 2007, 1.7% of Americans considered themselves Jewish (whether on religious grounds or ethnic ones) and 0.7% consider themselves Muslim.
For a comparison, 78.4% consider themselves Christian, and 16.1% are not religious.
http://religions.pewforum.org/affiliations
I thought I had read at least 5 years ago that the muslims had passed the Jews