Firstly I heard that fishing was the sport with the most participants.
Returning to Jacki's original statement, according to
World Atlas 2018, quoted in Wikipedia, the most popular sport in the world is association football (aka 'soccer' in some parts of the world) with 4 billion participants, followed by cricket (2.5 billion) and hockey /'field' hockey (2 billion).
Angling is not included in these statistics, since SportAccord (GAISF, the Global Association of International Sporting Federations) specifically excludes from its definition of 'sport' any activity which is 'harmful to any living creature'.
Whatever else they may be, "huntin', shootin' and fishin'" are not sports.