Changing one's religion for marriage purposes

Q: I want to marry a girl from a non-muslim (qadiani) family. She has accepted Islam and my parents agreed with me. The problem is that her parents who are still qadiani want me to become temporarily qadiani for marriage purpose, to save their reputation in the community. They promised that after marriage we can go back to Islam and they will have no problem with that. My question: Is it allowed to become temporarily a qadiani only for marriage (only on papers)? I tried everything to get another solution but without any success. The girl doesn't want to leave her parents in such a way and hurt them. I also consider the consequences of my decision, if I let her fall she could return to kuffar and marry a qadiani as her parents wish. If I marry her, I could bring a kafira to Islam. Please answer my question in the light of Islam.

Deception

Q: If a person has a disability but on the form he fills out to claim benefits he makes up some stuff about the help he needs for example he says he needs help eating and cutting up food when he doesn't and he needs help getting to the masjid but he can go on his own does the money he receives become haram as the amount of money he would get depends on the help he needs. So the person has got the actual illness (he hasn't lied about that) but just about the help he needs.

Wazifa for shifa

Q: Please tell me a wazifa for my mother as the doctors tell her that she may be suffering from womb cancer. So to confirm that she had a test on 11th of December. Please give me a wazifa so that all the reports come negative.