The Presbyterian Church I attended Sunday school at in Hull in the 1960s and early '70s had originally been an 1870 neo-Gothic structure. But after the Lufwaffe paid a flying visit in 1941, the premises had to be demolished and in 1949 two large houses were knocked together to form a new chapel.
I suspect that such was the fate of many small chapels and churches in the Nonconformist tradition. Their replacement with less elaborate structures had much to do with limited funds and post-War shortages of building materials for non-essential buildings.
It is to be noted that that CoE, RC and larger Methodist churches are often spatially separated from surrounding buildings and were less likely to be hit.
One exception being Coventry Cathedral, which was in the city centre, surrounded by factories and workshops. It was destroyed in the Coventry Blitz, and instead of being rebuilt, was replaced by Spences' modernist monstrosity. This is a dreadful bastardisation of the traditions of Church architecture equalled only by the bizarre Roman Catholic Catherdral in Liverpool, known colloquially as 'Paddys Wigwam'.
As to modern churches, they are built to serve the new estates, both private and Council, that sprang up in the Post-War years, and share elements of both design and purpose with the community centres built at the same time. Deliberately consistent with the overall design concept of the estate.