After years of pushing the Obama administration to issue an executive action granting protections to undocumented immigrants, advocacy groups are now gearing up for a dramatically different challenge: making sure that policy actually works.

There is a vast difference between advocating for action and implementing it. And if the jump isn't made seamlessly, reform advocates worry, it could endanger the gains they have made and complicate prospects for future, further-reaching reforms.

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Jim Wallis, founder and editor of Sojourners magazine, said much of the outreach work the religious community plans to do will take place in the pulpit.

"The reality is many of these people are already in our churches," he said. "They are in our congregations. They are in our networks. The greatest growth in many of our churches across the country has been immigrants for a long time. It’s not like they are strangers and we don't know where they live. These are our brothers and sisters."