There are a number of synonyms for the word "evangelistically" that can be used to describe the manner in which one seeks to communicate or persuade others about a particular idea. Some possible alternatives include "proselytizingly," "missionarily," "preachily," "zealously," and "ardently." Each of these terms conveys a sense of passionate conviction and a desire to share one's beliefs with others, and can be used in a variety of contexts, such as religious evangelism, political advocacy, or marketing and sales. Ultimately, the choice of synonym will depend on the specific tone and emphasis that is desired, as well as the particular audience and message being conveyed.