Atheists claim to be anti-religion, but never have problems with what Muslims do...
The trouble with getting atheists to condemn what the Islamic Jihadists do in the name of their “religion” (in reality not a religion at all, but a very intense ideology that clothes itself in “religious” trappings) is that the atheists are scared of the bearded men with burning eyes.
It is OK to challenge and disparage those who speak softly and with their hands raised to the heavens, calling for grace and forgiveness for the unbelieving. The Muslims tolerate no disagreement from those whom they consider “unbelievers”, giving them only the third of three choices.
Because for the True Believer Muslim, there are only three states for humans to be found in, the first being the Noble Islamic Gentleman, anointed by Allah. The second rank, the Dhimmi, are permitted to pay a tax called jizya, for which they may be able to practice their personal beliefs in private, but they are forbidden to proselytize others. The entire female gender falls into this category, with an exception being made so long as they are part of the household of a Noble Islamic Gentleman, in which instance they are not subject to jizya.
Then the kufir, the “infidels” or “unbelievers”, fit only for a life as a slave or eunuch, with the least disobedience making them subject to the immediate slaughter by the Noble Islamic Gentleman, on almost any whim.
Most atheists would fit into this last category. Darned straight they should be unwilling to make any challenge to the Muslims.