You really do miss the point...
Laws should be obeyed, so long as they are reasonable. When laws are unreasonable and unjust, then people have a right to rebel.
By your logic, if tommorow the Pak govt were to say all Muslims should stop being Muslim, you would gladly oblige.
And the reason they make a building to resemble a mosque is because
a. They say they are Muslim, and refuse to be told otherwise.
b. Because archtecture is not copyrighted by Islam. A mosque can take any shape, be arabesque, moorish, or whatever. You might be interested to know that the early Islamic Archtecture was influenced by Byzantine Christian architecture... And there are even Churches and synagogues that look like Mosques!
So its pretty ridiculous no matter what angle you look at it.
And untill you accept this reality that non of the Muslim clans accept qadyanies are Muslims, and by believing in the prophet-hood of Mirza Ghulam Ahmed Qadyan, they have accepted some other sharia and are no longer part of nation of Islam...
Now u did mention something about history, so let me add my two cents in that part as well, I don't know if you are familar with Qaramti Movement, they had same believes as Qadayanies have but instead of coming up with conspiracies, they were of violant nature...
They were kafirs, and they thought all other muslims are kafirs as those muslims does not believe in their prophet...
BY any point, it is not appropriate, to have a mosque resembling some other religion.. remember qadyanies are Kafir and Zandeeqs, so doesn't matter what angle u use, anyone using mosques and are not muslims must have some kind evil-intentions to decieve others... thats y the law is there... if u don't like it.. leave the country and go away...
Anyway most of the time this whining of opresion from the Ahmadies are because they want to have asylum in Germany and UK ( thats where they are in big number i guess).