Emotion, not reason here. An emotional argument in favor of the perpetuation of other irrational beliefs.
If Suzie has two mommies, no one can actually deny that. The rest of this could be debated, but Suzie still will have two mommies.
The lack of a Nativity scene is immaterial to whatever Islam is, whatever the military does.
Should the taxpayers be forced to pay for a Nativity scene, which teaches a rather irrational view of human reproduction, ie that on one celebrated occasion, a teenage girl was impregnated by a Deity, which caused the birth of a second Deity?
Should they also be taught that Mohammad rode his famous horse from Mecca to Jerusalem, up to Heaven, and back to Mecca in a single night?
Of course, Santa and his reindeer represent EIGHT flying mammals,and they are said to visit every home on the planet in a night. But I don't recell hearing that in school, either.