Degas,
The reason I didn't reply was because you never asked any questions. You only quoted something and made your own comments & conclusion based on that. And as I don't think my response will make any difference in your opinion, I thought it better conserve my energy for better use else where. Now that you insist I will write something up.
(1) First, I do not have the book you quoted nor have I read it. It's a good practice to give give the URL from which you copy-pasted this, just to see if they have the original text. Though even if I take your word on its accuracy of translation, even then I don't know why are you so upset about it? This book, if written by Mirza Mahmood Ahmad (ra), is probably of mid-19th century & there is a history of persecution of Ahmadis by the Non-Ahmadis as well as the Fatwas of Kafur aganist them, from the very day of the claim of Hazrat Ahmad (as) which was in the later part of 18th century. Certainly not something Bhutto invented.
(2) If you don't know, let me tell you that the restriction of Ahmadis to not follow a Non-Ahmadi in prayers was announced around 1900, close to 17-18 years after Mirza Sahib (as) claimed to be the prophet of Allah. For those first 17-18 years Ahmadis had no restriction on praying, marrying etc. with Non-Ahmadi Muslims. But during this time they were persecuted, thrown out of Masajid, beaten up if seen in a Non-Ahmadi mosque, the women who converted were deserted by their husbands according to the Fatwas issued by the Mulvi Sahiban of those times saying that their conversion dissolved their marriages ... and the list goes on. Therefore, in light of the disorder that such activities created & persecution that was persistant, Ahmadis were asked not to go to Non-Ahmadi Mosques or pray behind Non-Ahmadi Muslims.
(3) So, first Ahmadis are beaten up for saying prayers with Non-Ahmadis & thrown out of mosques & the husbands abandoned their wives ... and when Ahmadis refused to do so themselves then they are accused of not praying along side other Muslims?! Where is the justice in that?
(4) Still this decree that you quoted is not followed word to word as you have assumed. Usually its understood that those who do not have anything against Ahmadis or in other words do not consider Ahmadis as Non-Muslims/Kafirs (going back to the Hadiths I mentioned), praying behind them or marrying them is not forbidden, just not something recomended. Usually its required to take permission from the jama'at.
About 10 years ago, when my brother along with a two other Ahmadis came to the city I reside in today, they went to the local mosque regularly for Jummah prayers for close to 6-7 months. Then there was a shift in the administration of that mosque & the new Maluvi Sahib started calling names to Mirza Sahib in every other Khutba. And so, they stoppeg going there because those who reject the Imam appointed by Allah & call him abusive names, how can we consider him our Imam?
(5) You are mistaken if you think that all Muslims consider Ahmadis as Non-Muslims. I have many close friends who have no prejudice against my faith or Mirza Sahib.
(6) Lastly, all sects of all religions (Islam being one of them) marry among themselves. There are exceptions but on a general rule of thumb marrying outside the sect, praying with them etc. creates complications & thus are discouraged, Ahmadis are not doing something out of the ordinary.
(7) There is a difference in calling/declaring someone a Non-Muslim and not marrying with them or saying prayers behind them. Most sects in all different religions around the world have this practice even though they do not call others Non-Muslims, or Non-Jews, Non-Hindus etc.
(8) Hazrat Mirza Bashir-ud-din Mahmood Ahmad (ra) is not the only son of Mirza Sahib (as), check your sources again.
Now, after my explanation if you are you still going to quote some more books and try to prove that what I believe & have explained above is really not my faith, but its actually what you think/assume/conclude, then please understand that religion can be twisted whichever way one pleases. You can quote one verse from the Bible & make Jesus (as) son of God (Naozubillah) & quote another one to make him a man! One verse of Quran to ligitamize the killing of Non-Muslims and the other that forbids it. So, taking just some quotes from the books and making them out of the context objections is something very common. Anyway, if you chose to go that route, I sincerely hope that you will not insist on me wasting my time continue to answer your questions.