I think my respect for you just skyrocketed downwards like 33% in 4 secs. Wow. Burning down a place of worship eh? Wouldn't ever propose burning down a church. I understand it's not the brightest idea to request building a mosque in that specific location, but hoping that they burn it down??
If the situation was "reversed" and someone somewhere wanted to build a Catholic church on the grounds where a group of Catholics flew planes into a couple of buildings (and therefore spread god knows how many peoples ashes and remains onto the ground below) I would say burn the churn down too.
Its probably the most tasteless idea Ive heard in a long time.
Call me old fashioned, but what about just a plain vanilla memorial for the dead?