islamic "culture" is and has shown that it's impervious to change; therefore I disagree with your statement.
On a slightly different note,
I think a problem with Christians not having thorough knowledge of Islam make them vulnerable.
As you wrote, know thy enemy.
When you know about Islam, you won't be frightened by the radicals and coerced into the type of Modus Operandi George W Bush is/was into. But rather focus on pointing out what is actually written in the Koran.
The Islam-huggers like jaguar and Proteinfarts are defenceless when you stick with the facts.
Also, a big problem today is that many who are against Islam, don't know jack shit about the religion. Some of them are low life scums, racists and neo-nazists.
Here is really my focal point:
As long as the ignorant extremists are allowed a monopoly on the anti Islamic point of view, there is little room for real improvement.
Many of these groups are not only extremists, but also racists and anti-democratic.
That is the real problem for the anti-Islamic movement today.
It has to remove the ignorant bastards, to get rid of the racists, the anti-democratic elements, the anti-intellectuals.