Is Islam a race?

No

Ask the white Muslims of Bosnia and Albania.

No, not a race
Example
Iranians are pure original Arians. Had their own religion. Got invaded by the Arabs who had become muslims not long before that and forced the iranians to ditch their own religion and become muslims.
Islam became so powerful that it spread from Arabia to as far as Spain. Many spanish are muslims because of this reason

no. it's a cult of psycho-killers.

Then why are the critics of Islam called ''racists'' even when they don't do anything except criticizing a religion ( islam) ?

There are no Muslims in Spain because of that.

All Muslims were expelled from Spain in the 16th century, together with all jews.

Yes.
A race to hell.

I would doubt it as a religion isn't classified as a race.

Pure original Arians wouldn't get raped by a bunch of goat-shagging twerps

Are jews a religion or a race?

Judaism is a religion

Jews are a race.

Original jews are indeed a race

If it is, no one wins.

Every time people want to discuss Islam, others immediately bring up ''Da Joos''

nah...it's more like a destination LOLOL..a bad one

Nope.

Is Lutheran a race, ffs...

A race to see who can die the most :)