There are many ways to express your support of Israel in difficult times like these. For example, Jamie Cowen gives some practical suggestions in his article “YOU Can Do Something About the Crisis in Israel“.
Another great example, is the hundreds of Christians from the Zionist organization “HaYovel” who are “putting hands and feet to [their] love for Israel” (an apt description from the website). Despite the current violence they have decided to come to Israel to assist Israeli farmers in Samaria work the land and harvest their crops.