Hi, chandavanderhart.
As you have discovered, the Cufon font that ships with the Unite theme, Liberation Sans, does not include the Hebrew character set.
If you go to this web page you can create your own version of the font that includes Hebrew characters:
http://www.cufonfonts.com/en/font/277/liberation-sans
Click on Cufon Kit Download and scroll down the page until you see the Hebrew option, and then select that option. At the foot of that page select the option that agrees that you accept all legal responsibility, then click the ‘Font Download as cufon’ button.
The file that downloads to your computer will be named ‘liberation-sans.cufonfonts.js’. You need to rename it ‘LiberationSans.font.js’ and then you need to copy this file into the ‘wp-content/themes/parallelus-unite/js’ folder, replacing the font file of the same name that is already in there.