Mary, I understand your discomfort, but I'm not sure that what you're seeing is actually a "Nazi salute." In many traditions, blessings are given with an outstretched arm. For example, in Judaism, both arms are often outstretched when the rabbi gives what is called the priestly blessing.   In this instance, the person's elbows are slightly bent, and his or her hands are open with the fingers spread, and the palms face the congregation. I imagine that this is true of many other raised-arm religious blessings. Whereas in the Nazi salute, the arm and hand are held in a rigid line, palm down, with thumb and fingers closed together. It could be that the intent was to have a "blessing-like" gesture but some people do it differently so it resembles the military salute. Hard to say without seeing it in person. If other people in your church have the same reaction, then it might be worth mentioning it to whoever makes the decisions about such things.

Aloha,
Mark

PS, For those who might be interested, when the priestly blessing is given by a Kohen (a descendant of the priests at the Temple in Jerusalem, who were descendants of Moses' brother Aaron), the hands are not separated but are held together in a particular posture, which symbolizes the letters of the name of God, and also represents a window through which the Divine presence is seen. Leonard Nimoy saw this gesture as a boy, and appropriated half of it to make the Vulcan "Live long and prosper" sign!