The building is very unusual and is not like any other station in the area,even back in the 1820/30's many were built in a company 'style'.It was originally built for the Warrington & Newton railway so may have been the boardroom or headquarters,the 'Chapel' story has been around a long time and probably reflects it's appearance more than any actual use as one.
I had some involvement back in 1980 with the station when it was used as an exhibition for the 'Newton 150' part of the celebrations of the Liverpool & Manchester Railways 150th anniversary,the exhibition ran for several months over the summer of that year and many will probably remember the special steam trains that ran from Manchester to Liverpool and back for 8? consecutive sundays which stopped at Earlestown for about an hour on the outward journey to allow people to visit the exhibition.
The building was renovated by British Rail and the exhibition was funded by St Helens council,including a giant model railway depicting the Nine Arches area and exhibits from the National Railway Museum amongst others that had connection with the Vulcan ,Viaduct works etc.
When the exhibition closed the Model was dismantled (no mean feat ) as it was probably 30' by 15' and had been built as part of the exhibition and was never intended being dismantled,it was transported to Newton Library and set up in the room on the right as you entered,for a while it was operated for groups or visitors before finally being broken up about 1983 when the room was required for other uses.
The waiting room itself was left and closed up,with the building falling into disrepair again ,especially the roof which was eventually replaced many years later,what state the building is inside i have no idea.
The exhibition entrance was through the door on Platform 3 shown in the photo above,the exit being onto platform 2,the stonework on platform 3 did have some sort of 'Gargoyles' near the door is this the stonework mentioned above?