As explained under 2 Nephi 3:24, the original text had examples of intransitive raise (where standard English expects rise). Such usage was common in earlier English. The original text had four original instances of “raise up in rebellion” and four of “rise up in rebellion”. This instance of raise in Helaman 1:8 has never been emended to rise (that is, the sentence has never been emended to “for he had risen up in rebellion”). The three other instances of “raise up in rebellion” (in Alma 57:32, Ether 10:8, and Ether 10:14) have been emended to “rise up in rebellion”. For a list of all eight cases of “to raise/rise up in rebellion”, see under Alma 57:32. It is worth noting that here in Helaman 1, in the preceding verse, we have one of those instances of rise: “to rise up in rebellion against their brethren” (Helaman 1:7).
Summary: Maintain the intransitive use of raise in Helaman 1:8: “for he had raised up in rebellion”.