Most new parish churches were built in the ever-growing cities, where the expanding urban population necessitated new parishes. In the modern era there is more religious freedom, and with the subsequent splintering of Christian sects, and the introduction of more non-Christian religions into England there are few new parish churches built. And those that are may be interesting to their parishioners but to few others. Some of the old churches that once served prosperous villages have fallen into disuse and been abandoned as population shifted. Many of these churches are now being looked after by the Redundant Churches Fund.
Most parish churches are open to visitors.
Many churches have placards or handouts giving details of the building history and pointing out its architectural features. These small gems of living history give a much better sense of England and its culture than do the grandest cathedrals, and they're usually free. Just drop some small change in the donation box by the door.