I know the Israel Regional is Monday, Tuesday for religious reasons. There is also a student on our team that cannot come to robotics meetings on Sundays for religious reasons. There was even a team from Israel that advanced to championships last year that posted on CD asking about a surrogate drive team for Saturday at Championships (
http://www.chiefdelphi.com/forums/showthread.php?t=94505&highlight=surrogate+drive+t eam)! You're certainly not alone when it comes to respecting your religious commitments and beliefs, and the FIRST community understands and is here to support you if at all possible! Hope this helps!