England have the most registered players with 2.5 million
England have the most registered cubs with 2,549,196 players in 2099 clubs
England RFU has the most
rugby because there are more nations that play
Australia has the most Rugby players.
New Zealand has 121,928 registered players as of 2007. This figure coincidentally is the 6th biggest in the world and New Zealand has 8000 less registered players than the next most popular Japan!
Most likely football,rugby
the answer to your question on the most registered playered sport is korfball.
top ten most sin binned springbok rugby players