Laws pertaining to the Slaughterer

Sacrificing on the name of anyone besides Allah Ta'ala

Q: 

1. Is sacrificing meat for anyone other than Allah considered an act of shirk (associating partners with Allah), or is it regarded as a bid’ah (innovation) that does not amount to shirk? 

2. If it is indeed shirk, then what is the ruling if a Muslim sacrifices meat for a highly revered figure in Islam such as the Prophet Muhammad (peace and blessing of Allah be upon him), Prophet Isa (Jesus, peace be upon him), or Ali (may Allah be pleased with him); or alternatively, if the sacrifice is made for a sacred Islamic site like the Ka'bah or Masjid al-Aqsa? Would such an act nullify the person's faith (iman)?

Halaal status of meat products exported from Brazil

Q: As we are aware, Brazil exports meat and meat products worldwide. Even within the Arab countries, these products are exported and, according to my information, they are halaal certified. As a result, many Muslims consume these products. 

However, I have noticed that our Ulama forbid consuming them. I have some questions regarding this: 

1. What is the position of our Ulama on Brazilian chicken, regardless of the brand? 

2. Are there certain brands that are genuinely halaal? 

3. On what basis is meat exported to Muslim countries and certified as halaal? 

4. Why do our Ulama and the Arab Ulama differ on this matter?