"witnesses believe it was a cruise missile. There are many such witnesses."

Many people all over the world witness that they have a belief in 'God'...

"if a Boeing 757 had hit the building, either there would have been wing-shaped holes in the building"

I've already pointed out the short 'triangular sides' section of the entry hole.

"would have been wings or wing wreckage on the lawn"

Inertia would have tended to NOT bounce crap all over the lawn at a distance, but carry it forward towards the building.

"Planes ARE NOT MADE OF STEEL."

The bits also burn VERY well - just look at the after pictures of any plane crash that burned.

"accept aluminum going through steel and concrete but not limestone and brick."

1 - visual evidence.

2 - the 'steel' was not very thick.

3 - brick walls tend to be rather thick, and have you ever tried to demolish one with a sledgehammer? I have.