Muslims can eat from the food of people from earlier revelation unless their belief has been distorted to total atheism. If so, they are considered unbelievers and any meat they have prepared is unlawful to eat.
The unanimity of Muslim scholars agrees that a Muslim woman is not allowed to marry a non- Muslim including those who follow Bahai’ism as it is creed concocted with elements from Buddhism and other religions.
A Muslim woman can marry a communist only if he believes that there is no other deity than God and Muhammed is God’s messenger. In other cases it is forbidden. This article answers this question in details.
Muslim scholars have 2 different views on burying a Muslim in a coffin in societies where Muslims are minorities. The first discourages it and the second permits it in certain conditions as in case of soft land.
It is forbidden to Muslims to eat any food certainly mixed with what is forbidden like pork. In case of doubt about it then the food is permissible to eat, because the normal ruling is that things are permissible.
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Some scholars see that Muslims living in non-Muslim countries should refrain from eating doubtful meat or food. Others permit it unless they are sure it was slaughtered unlawfully or involve what is forbidden.
Muslims who are resident in non-Muslim countries are not allowed to eat meat from animals slaughtered by unbelievers. It is also prohibited to eat any food that is mixed with such meat including the sauce.
Some scholars permit that Muslims eat permissible animals slaughtered by people of earlier revelations if they live in non-Muslim countries. But electrically shocked animals are prohibited unanimously.