There is no serious breakdown of casualties in regard to who are combatants and who are not - only numbers

We have break down by age and gender.
If Israel are telling the truth, you would expect significantly more male than female killed.
If they are lying, you would expect parity.
What do we find Jim?.

If they are telling the truth, you would expect significantly more adults than children.
If they are lying, you would expect more children than adults.
What do we find Jim?

If they are telling the truth you would expect young men to be over-represented.
What do we find Jim?

Re selling arms to Isis, some states did to help to them fight Assad, which you would have approved.
They no longer need to buy arms. They capture more than they are ever likely to need.