"All of them. " So many of them." Which ever: still wonder how you would know either?
1. Where did I write "all of them"? (Clue: I didn't). Don't try and wave it aside with "which ever"; you made a silly assumption, presumably based on a sloppy reading of a short post, so have the minerals to admit it.
2. Experience - experience of many theists really not knowing what secularism actually means, conflating it, as does Vlad, with secular humanism or atheism or agnosticism or suchlike (or rather, in his case, anti-theism and "Stalinism" and whatever other daft wibble he comes out with).