What Is The Common Denominator ?

I came across these lists on
Kevin Sorbo's Facebook Page

What is the common denominator for all of these terrorist attacks?

Shoe Bomber

Beltway Snipers

Fort Hood Shooter

Underwear Bomber

U-S.S. Cole Bombers

Madrid Train Bombers

Bafi Nightclub Bombers

London Subway Bombers

Moscow Theatre Attackers

Boston Marathon Bombers

Pan-Am flight #93 Bombers

Air France Entebbe Hijackers

Iranian Embassy Takeover

Beirut U.S. Embassy bombers

Libyan U.S. Embassy Attack

Buenos Aires Suicide Bombers

Israeli Olympic Team Attackers

Kenyan U.S, Embassy Bombers

Saudi, Khobar Towers Bombers

Beirut Marine Barracks bombers

Besian Russian School Attackers

First World Trade Center Bombers

Bombay & Mumbai India Attackers

Achille Lauro Cruise Ship Hijackers

September 11th Twin Towers Attack
Answer

All of the terrorists were Muslims

What is the common demoninator for all of these organizations?

Islamic Jihad

ISIS

Al-Qaeda

Taliban

Hamas

Hezbollah

Boko Haram

Al-Nusra

Abu Sayyaf

Al-Badr

Muslim Brotherhood

Lashkar-e-Taiba

Palestine Liberation Front

Ansaru

Jemaah Islamiyah

Abdullah Azzam Brigades
Defenders of Islam
Answer

They are all Muslim terrorist organizations

After reading this post some people might think it is a little biased against the Muslims so I decided to make it as fair and balanced as possible. I decided to also draw up a list of every atheist terrorist organization, plus all of the terrorist acts they have committed. And what do you know? Nothing!

Update
A new addition to the list
(A terrorist attack that took place earlier today)

The Inland Regional Center in San Bernardin0
(14 dead, 17 wounded)

The terrorists were:
Syed Rizwan Farook
and Tashfeen Malik

Will they turn out to be Muslims?
Or atheists?

What do you think?