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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Valid markup can help the crawlability of your page and should also be encouraged as far as usability is concerned. But there's no difference in SEO if you add or remove a div tag. If you want to emphasize keywords on your page you might consider using "strong" or "em" tags. Also h tags e.g. h1, h2, ... have effect on SEO, although not the big effect it used to have some years ago.
What do you mean by saying "a div in place of normal text"? Apart from that, what's that got to do with CSS? All I see is valid markup and that's how wegpages should look. 