Church

церковь is the only viable term but in Russian usage overwhelmingly denotes either the Russian Orthodox Church as an institution or a physical building (храм). Romans’ sense of church as the gathered people of God, especially in Protestant/Evangelical minority congregations, needs explicit framing so readers do not default to ‘the [Orthodox] Church’ as the only referent. собрание (assembly/gathering) is acceptable as a clarifying synonym for the local congregation.