Adrian Hilton, a proponent of the process, said missional projects and dialogue between churches and their European counterparts will continue undisturbed once the UK leaves the bloc.
Speaking 500 days before the official exit date, he said: "There is no change at all; we simply revert to the pre-1973 situation [prior to when the country joined the EU].
"There were churches all over Europe then, we were perfectly happy to work with them; mission is not remotely affected."
Giving his verdict on the Brexit talks so far, Mr Hilton said he was "satisfied", given the UK was never going to leave in "one fell swoop".
Mr Hilton said he could not fathom the concern he detected among Church of England leaders, adding that all but one of the bishops he had spoken to have expressed fears about Brexit.
The Brexiteer also said the UK would be better off finishing exit negotiations without a trade deal, than spending up to "£80 billion" on a divorce deal.
He also criticised the media for what he perceived as cynical coverage which implies EU leaders hold all of the cards in negotiations.
Mr Hilton went on to say: "They have a potential loss as well as and that is something that they, of course, want to avoid.
"When it comes down to the trade talks, things will be rather more amicable."
Click here to listen to Premier's John Pantry and Rosie Wright speaking with Adrian Hilton: