Jamaat Salaah and Imaamat

Q: Can we offer namaz behind a person who commits shirk or has the aqeedha of shirk?

Q: If the ahle hadith wash their feet with water during wuzu after taking their socks off can we offer salah behind them?

Q: Is it permissible for an Aalim who is appointed as Imam in a musjid to receive salary for Imamat whereas the five times salaah is obligatory for
the imam also and also it is a duty of a muslim who keeps the knowledge of fiqh and recites quran properly to lead the salah only for the sake of Allah without a salary?

Q: When the Imam says Sami Allah Huli man Hamidah, I try to say Rabbana Wa la kalhamd. But before I finish saying it, the imam says Allah Hu Akbar and goes into sajdah before I have finished saying Rabbana Wa la kalhamd. In this case, should I:

1. Stop saying  Rabbana Wa la kal hamd as soon as the Imaam says the takbir and goes into sajdah?
2. Continue to say Rabbana Wa la kalhamd while following the imam into sajdah?
3. Do not say Rabbana Wa la kalhamd at all knowing that I won't finish it in time before the imam goes into sajdah.

Q: In the mosque where I pray, the Imam stands at an angle of 5 degrees if compared to the people behind him and keeps rotating more at and angle of 5 degrees while reciting the Quran. He is in proper alignment with people during the rukhu and sajda. The same continues in the next salah where he is at an an angle of 5 degrees and then keeps rotating. But when he reads his sunnah he reads normal i.e he stands straight and does not rotate. Also he keeps touching the mimbar which is close to him as it is small mosque while going into rukhu and sajda and while getting up from rukhu and sajda. Me and my friends had asked the reason to many elderly people who come to the same mosque who said that the concentration level of his is very high so he does not notice that he is rotating and touches the mimbar for support (he does not require support while reading sunnah as he prays any where behind). No one wants to tell this to the Imam as he short tempered. So will our salaah be complete/fulfilled or should I opt to pray at home as there is no other mosque nearby?

Q: In maghrib I missed 2 rakaats and joined the 3rd rakat, how should I complete the two rakaats?

Q: If the Imam breaks his wudhu during salaah, does the entire congregation need to break their salaah and wait for the Imam to do wudhu and then restart the salaah or can the Imam select a person from behind to complete the salaah while the Imam goes to do wudhu?

Q:

1. If the Imam is in or has just gone in to Ruku and one joins the Jamat, do you have to drop the hands to the side and stand a few seconds after saying Allahu Akbar or can one just raise the hands, say Allahu Akbar and go straight in to Ruku?
2. If one joins the Jamat late and before finishing reciting Attihiyyat up until Abdoohoo Wa Rasoolooh, the Imam does Salam, does the person complete the recitation of Attihiyyat or does he stand up immediately to complete the missed rakats?

Q:

1. When following the Imaam, is Rabbana-lakal-hamd recited while getting up from ruku, or once in the standing position?
2. What is best to recite after getting up from ruku? I have been told slight variations of the above.

Q:

1. If the Imaam is in ruku, does one have to first tie the hands and stand in order to get the rakaat, or does going directly into ruku after takbeer suffice?
2. If one makes takbeer and while going into the sitting posture the imaam makes one salaam, can one still join the salaah?
3. If one has to complete missed rakaats in jamaat: In the final sitting, does one read attahiyat, durood as well as the dua, or just stop after reciting the shahadah?