Are there no Christian Palestinians that condemn this celebratory behavior?
Privately, I'm sure there are. Publicly, it's dangerous.
ML/NJ
They largely support the aspirations of Muslim palestinians.
Sadly most of the Christian Palestinians have either been killed, driven out, or are living in fear for their lives to be of much help.
The Christian Palestinians support the Muslim Palestinians. While generally not as violent, they do also occasionally participate in terrorist groups. See George Habash, Azmi Bishara, & Nayet Hawatmeh, for example.
Sure, they get some harrassment from the Muslims, but not as much as you think. Their hatred of Israel is sincere, not coerced.