During a recent church service I revisited my 15 year old project of counting male and female church attendees with the aim of getting the mix. I sampled a large block of attendees that were visible from where I was sitting - that is, I didn't take a count of the whole congregation. I did two counts and came up with the numbers 28 males to 54 females and then later in the service I counted 35 males to 55 females. (There were some comings and goings during the service). Those two sets of figures give returns of 35% :65% and 38%:62% respectively. That might point to a slight drop in the male proportion since my last counts but on the whole that's fairly close to the four to six mix which has otherwise been stable over 15 years; after all, we've been through a lock down which has definitely perturbed churches in many as yet unforeseen ways, not to mention the ongoing decay of church populations. There may be a differential in the way these two factors are effecting men and woman. But given these factors it's surprising how steady the 4 to 6 mix is.
For more see here:
Norwich Churches and Belief Communities: FourToSixMix (norwichcentralbaptistchurch.blogspot.com)