A man lives within a community that commits shirk (polytheism) by appealing for help from other than Allah. Is he allowed to pray with them with their leading the prayer? Is it obligatory to abandon them? Is their Shirk considered shirk al-akbar (great and serious act of disbelief by associating other beings with Allah's supremacy)? Is alliance with them treated the same as alliance with true non-believers?

I have a question regarding the permissibility of becoming a law enforcement officer in this country that does no follow sharee 'ah. Is it haraam to be enforcing laws that have not been developed by our Creator Allaah and His holy Prophets (upon whom be peace)? Even if it means enforcing laws on non-Muslims?

Partciluarly, is it permissible to enforce a law like punishing someone for speeding on the highway? What about allowing someone to drink alcohol if he is over 21 but not if he is under 21? Even though this is not Islamic, should a Muslim allow such behaviour among non-Muslims? Of course, Muslims will be accountable for these haraam actions in the Hereafter, but is it okay to let non-Muslims do this?

In Australia during christmas there are huge discounts on things like clothing, furniture, electronics etc. is it permisible to shop to get this discount which is generally not available during other part of the year?

Can muslims accept donations from non-muslims to use in Islamic Cause?

My neighbour is an American Christian, and she and her family brought me a gift when it was Christmas. I could not refuse the gift, lest she be offended.  
Can I accept this gift, as the Messenger (peace and blessings of Allaah be upon him) accepted gifts from kaafirs?

If a non-Muslim visitor comes and lives in your home for a few days is it permissible that the Muslim host allows him/her to perform their prayers and rituals according to their own religion? Will the Muslim host be considered a sinner in this case as some of the prayers and rituals of other religions may not conform to Islamic beliefs?

What is your response to the one who says that so long as the Muslim has an atom’s weight of faith in his heart, he will enter Paradise even if he commits zina during his lifetime? 
What do you say to the wife who betrays her husband by committing the immoral act of zina for the sake of sexual pleasure?.

Is it permissible to give charity to non-Muslims if they are in urgent need? Will the person who gives such charity be rewarded?

If the Muslims celebrate the birthday of the Prophet (blessings and peace of Allah be upon him), why do they not celebrate the birthday of the Prophet of Allah ‘Eesa (peace be upon him)? Is he not a Prophet who was sent from Allah, may He be glorified and exalted? I heard this idea from someone, and I know that Christmas and the celebration thereof is haraam, but I want an answer to this question. May Allah reward you with good.

How merciful is Allah, because I heard he loves you more than 70 mothers. Is that true? Please explain?

Is it permissible for me to say to non-Muslims "And the same to you" when they wish me a Happy New Year or say Best Wishes?