"Again, getting the first goal settled us down and we pretty much dominated the game until the last minutes when they threw everything forward.
"So now its home to a resurgent Brady which will no doubt be another tough game."
RJC coach Danny Berg told JC Sport: "It was a very comfortable win - it took us 10-15 minutes to get going but apart from that we played some good football all over the pitch.
"All the lads are buzzing to be in one cup final already - we have never won the national cup so everyone can't wait to play Brady in the semi's which im sure will be a very good game. "All in all another strong win from us."
Raiders chairman Jonny Adelman, who took charge of the team in the absence of manager Rob Richman, told JC Sport: "We kept compact and battled well, but were undone by the direct ball against a well-drilled Redbridge. I couldn't have asked any more from the boys, especially with our wide players missing.
"We're very motivated to finish the league season strongly and most importantly we wish the gaffer a huge mazel tov on the arrival of baby Jake!"