Seem I'm not the only one with these problem, and here's my experience and the save files.
I received this quest in the year 1684AD (on marathon speed), while I was reasearching Radio (keep in mind that the quest fails while you reach Industrialization).
As a standard size map, the quest hints that with 14 religious buildings the location of the holy mountain will be revealed. In fact at this time I already have 20 temples, 6 cathedrals and a couple of monasteries, all in my state religion (Christian), but unfortunately the holy mountain remains hidden.
So I decided to build one more Christian temple in my latest city, hoping that the completion of the new temple could somehow "trigger" the counter of religious buildings. The attached file "save1" was at this time.
The result was negative. Then in curiosity I opened the world builder. Since it is a "terra" game, almost all unoccupied peaks are on the new continent. So I add a settler next to each of the peaks and build a series of cities to cover all the mountains. But after a few turns theres still no sign that I have complete the quest.
My next try was to build a Christian temple in each of the new cities added by WB and there are more then 20 of them. However even with these religious buildings, the location of the holy mountain is still unkown.
In desperation I gave myself the tech "Industrialization", hoping that during the check on quest failure the program could realize that the holy place is already in my border (theoretically it must). Finally on the next turn, I received the quest failure message. The attached file "save2" has recorded this world in mass

I received this quest in the year 1684AD (on marathon speed), while I was reasearching Radio (keep in mind that the quest fails while you reach Industrialization).
As a standard size map, the quest hints that with 14 religious buildings the location of the holy mountain will be revealed. In fact at this time I already have 20 temples, 6 cathedrals and a couple of monasteries, all in my state religion (Christian), but unfortunately the holy mountain remains hidden.
So I decided to build one more Christian temple in my latest city, hoping that the completion of the new temple could somehow "trigger" the counter of religious buildings. The attached file "save1" was at this time.
The result was negative. Then in curiosity I opened the world builder. Since it is a "terra" game, almost all unoccupied peaks are on the new continent. So I add a settler next to each of the peaks and build a series of cities to cover all the mountains. But after a few turns theres still no sign that I have complete the quest.
My next try was to build a Christian temple in each of the new cities added by WB and there are more then 20 of them. However even with these religious buildings, the location of the holy mountain is still unkown.
In desperation I gave myself the tech "Industrialization", hoping that during the check on quest failure the program could realize that the holy place is already in my border (theoretically it must). Finally on the next turn, I received the quest failure message. The attached file "save2" has recorded this world in mass

