Here is the last paragraph of his review. It has nothing to do with the political/theological ideas at play nor is he trashing it.
‘”October Baby” is being promoted as a Christian film, and it could have been an effective one. Rachel Hendrix is surprisingly capable in her first feature role, and Jasmine Guy is superb in her scene. Unfortunately, the film as a whole is amateurish and ungainly, can’t find a consistent tone, is too long, is overladen with music that tries to paraphrase the story and is photographed with too many beauty shots that slow the progress.’
“...the film as a whole is amateurish and ungainly, can’t find a consistent tone, is too long, is overladen with music that tries to paraphrase the story and is photographed with too many beauty shots that slow the progress....”
That is what Ebert says and it is not true so it is indeed trashing the film.