No, it is not forbidden in Islam to desecrate houses of worship. It is encouraged! Otherwise, explain to me, if you can, why the tomb of Joseph was desecrated several years ago. Forever burned into my brain is the picture of hateful Muslims stomping on holy texts with their filthy feet. At the top of one text was the holy name of G*d. A Muslim had his foot posed over it and a huge grin on his blasphemous face. After you explain that one, explain all the destroyed synagogues in Aza. I'll let a Xian comment on destroyed and desecrated churches.
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from the article: Share the Temple Mount