Here the 1852 LDS edition introduced the plural crimes. Nonetheless, Nehor is being tried here for a single crime (namely, the murder of Gideon). Nehor’s establishment and promotion of his own religion was not a crime under Nephite law (as discussed in Alma 30:7–11).
Summary: Restore in Alma 1:10 the singular crime, which makes better sense since Nehor is being judged for only one crime, the murder of Gideon.