Zikr & Dua

Q: My Question is that why we say 'Peace Be Upon Him' for Holy Prophet? Is Holy Prophet not in peace and safe?

In the Holy Quran Allah says that when beleivers come to you say to them ''salam alaikum - may you be safe" so this verse is for living people not for those who have passed away and we are sure that Holy Prophet is safe and in peace. So why "Sallallahu Alaihi Wasallam"? As generaly given refrence is that Allah says in Holy Quran that I read and My angels read salat to Holy Prophet so you should also read but actually the sense and meaning of this verse is "I and My angles help Holy Prophet and you should also help him" Please explain.

Q: Can you please tell me about durood e tunjeena? Is it an authentic durood? Can someone recite it?

Q: Can a Muslim boy pray to Allah to marry a Hindu girl? For example he says like this "Ya Allah, give her hidayat so that I can marry her.

Q: I really want something and I've been making a lot of dua for it. Also, I started performing tahajjud salaah for it. I need it urgently. How would I know that Allah will accept it or not?

Q: Is it permissible to ask for baby boy specifically while pregnant? If so are there any duaas to read for this?

Q:

1. Can I recite durood without wudhu or I've been doing a sin?

2. Which durood should I recite before I sleep because I only recite Sallallahu Alaihi Wasallam or Sallallahu Alaihi Wa Aalihi wa Ashaabihi Wasallam and I drink milk every night.

3. I know Rasululllah (Sallallahu Alaihi Wasallam) taught us a du'a after drinking milk. Can you please teach me that dua'a.

Q: Someone told me that we should not ask Allah Ta'ala for patience. If w​e ask for patience, Allah Ta'ala will afflict us with trials. Instead, we should ask for a blessed life and a grateful heart. Is this correct?

Q: Is it permissible to ask for forgiveness in sujood?

Q: I was making the following zikr la ilaaha ilillah 100x , ilillah 100x and allah Allah 100x, thereafter a Somalian brother approached me saying that where do we learn this from as it is not in any hadith or quraan. So I replied by telling him that we get it from our ulema and he should consult with them as they will issue the necessary proofs. He seemed very disturbed and said that these are from people who made they own ways, and to an extent he mentioned that some were Shia''s, this has now brought some doubt. he also mentioned that in the books of azkaar , he have found La ilaaha ilillah amongst them, but never found Ilillah or Allah Allah on its own. Could hazrat please advise as it is still giving some doubts.

Q: If you wear a necklace with Allah written on the pendant or ayatul kursi written on it then what should you do when you enter the restroom? Do you have to take it off or what