One could argue that point... however, the critical factors are
1) that those who murdered 3000 in the WTC did it following the tenets of Islam.
2) The perpetrators expected rewards in the afterlife.
3) Muslims around the world danced in the streets at the news of the death and destruction.
Even if McVeigh had literally said, "I do this in Christ's Holy name",
1) he still would not have been following basic Christian tenets.
2) He could not possibly have used the Bible to argue that the Almighty would reward him specifically for that act. Likewise,
3) his actions were condemned by Christians everywhere, as they wept and expressed shock and regret.
Your sophmoric attempt at moral equivalence won't fool anyone around here.