Their brethren have murdered multiple Europeans for just walking the streets of their own cities.
I will never support jihadists, no matter what sort of cause they profess to defend.
Their important common denominator is "we believe in bringing about submission to Allah at the point of the gun". I would advise any "unbeliever" to stay the hell away from any such group.
When Hamas lets Christians live, they are doing what Islam considers right. Outright pagans (polytheists) would be a different story.
Still, they enforce Islamic law where they rule. You cannot be openly gay, you cannot openly proclaim that you no longer believe in Allah (apostasy), a Christian man cannot marry a Muslim woman.
The fact that some other fundamentalists go further than Hamas doesn't make Hamas non-fundamentalists.