Mosiah 25:18

Therefore Alma did go forth into the water, and did baptize them; yea, he did baptize them after the manner he did his brethren in the waters of Mormon; yea, and as many as he did baptize did belong to the Church of God; and this because of their belief on the words of Alma.

So Alma went into the water and baptized them. He baptized them the same way he baptized his brothers at the Waters of Mormon. Everyone he baptized joined the Church of God. They joined because they believed Alma’s words.

So Alma went into the water and baptized them—the same way he had baptized his people at the waters of Mormon. Everyone he baptized became part of God’s church because they believed Alma’s words.