Sarah, you probably already know this, but now, the police DO know what caused the fire.
Their own attorney arranged for the fire and more recently attempted to have the scientology center blown up.
No evidence (yet) that scientologists were aware of and/or ordered this to be done.
But they certainly stood to benefit had it been carried out according to plan. The intention was to make it look like the work of Orthodox Jews, who are opposed to Scientology being there.
http://www.ynetnews.com/articles/0,7340,L-4069940,00.html
"Police surveillance discovered that the man who ordered the "hit" on the Scientology center was none other than the Scientologists' very own legal representative in Israel and worldwide, Attorney Gur Finkelstein, who stood to benefited from the future reconstruction work, due to a close connection with the building contractors."