I have a friend, he does not believe in God. I believe that he is a good tempered person actually, so I want to make dua for his hidayah and faith. Is it permissible?

Is dua (supplication) worship? Is there any reward or fine in return for our good and bad duas?

WE believe that everything is predetermined in destiny. We pray and it comes true if it is predetermined in our destiny. If it is not, our prayer is not accepted.  That is to say, dua changes nothing in our destiny. Then, why do we pray?  

Why do we make dua although Allah (swt) knows the best for us?

Is there any dua or Quranic ayah or surah that can be recited for easy child-birth when the delivery day is close?

While I’m performing wudu for fajr prayer, I feel some presence in dark behind me. Even after salah when I switch the lights off, I feel the same way. Can you explain why this happens? Is there any dua that I can say for help?

If you have a close family relation who claims to no longer believe in God and actually makes fun of God and those who believe, then is it a sin to pray for his welfare?  

While visiting a graveyard, which prayers should we recite and can dead hear our duas?

Are the prayers of sinners acceptable?