I have a few questions I’d like answered if possible. I’ll list them in order in shaa Allah.

Through the Shia view-

1. Are we allowed to make duaa for the deceased non Muslims who are part of Ahlul Kitab ( Jews, Christian’s and sabians)

2. Are we allowed to make duaa’s for the deceased non muslim who are not from Ahlul Kitab? ( Buddhists, Bahaii’s, sikhism, Hinduism etc)

3. Are we allowed to make duaa for the deceased who is an Atheist or Agnostic?

4. Are we allowed to visit their graves? ( believers and unbelievers)

5. Would it even be haram to say “ Allah Yerhamo” or “ Allah Yerhama” to a deceased Christian and Jew?

The answer is No for the first 3 questions, and the unbelievers in Q4.

Q5 If you assume that he was ignorant and did not oppose the truth, then it is permissible