The state of Israel had the most to gain, and there's no shortage of Zionist fingerprints for 9/11 security, and distractions run for US intelligence agencies. There's also plenty of evidence that the Bush administration was involved, especially relating to war games and response protocols. The ambition of  taking out "seven countries in five years" described by Gen. Wesley Clark as the US military response to 9/11 is a good match for Theodor Herzl's ambition for the Jewish state aka "Greater Israel". The religious context for this is prejudice against the descendants of Ishmael, probably relating to the two covenants of the land of the middle east (Genesis 15:18 and Genesis 17). So not your ordinary kikes, but people using religion to further their own political ambition.