"No they are not God.
They are not omniscient. If they hear our prayers it is because it is God’s will that they do and He will make it possible."
"IF" they hear our prayers.
And if they don't we are praying in vain,
But as I pointed, out we know they heat our prayers.
We know that those in heaven are aware of what is happening on earth.
Lk 15:7 &
10
Rev 6:10
We also know that (at least) some of those in heaven are presenting out prayers before the throne.
Rev 5:8 &
8:3
Tobit 12:12
My preference is to pray to God the Father directly in Jesus name where I KNOW my prayers are heard.
That's the way I approach prayer, how my life has taught me it should be done, but I suppose each person has to decide that for themselves if their prayers are to be sincere as prayer.
I find no need to put someone between myself and and God.
Paul asked people to pray for him:
"Pray also for me, so that when I speak, a message may be given to me to make known with boldness the mystery of the gospel, for which I am an ambassador in chains. Pray that I may declare it boldly, as I must speak." (Eph 6:19-20)
"At the same time pray for us as well....." (Col 4:3)
"Beloved, pray for us." (1Thess 5:25)
"Finally, brothers and sister, pray for us....." (2 Thess 3:1)
“Pray for us; we are sure that we have a clear conscience, desiring to act honorably in all things.” (Heb 13:18)
Why did he not just pray to God himself.
It seems he valued the prayers of others on his behalf.
There are examples of people praying for others:
“The prophet Jeremiah said to them, “Very well: I am going to pray to the Lord your God as you request, and whatever the Lord answers you I will tell you.’” (Jer 42;4)
In one instance at least God specifically commands it.
"After the Lord had spoken these words to Job, the Lord said to Eliphaz the Temanite: My wrath is kindled against you and against your two friends; for you have not spoken of me what is right, as my servant Job has. Now therefore take seven bulls and seven rams, and go to my servant Job, and offer up for yourselves a burnt offering;
and my servant Job shall pray for you, for I will accept his prayer not to deal with you according to your folly; for you have not spoken of me what is right, as my servant Job has done.” So Eliphaz the Temanite and Bildad the Shuhite and Zophar the Naamathite went and did what the Lord had told them;
and the Lord accepted Job’s prayer."(Job 42 :8-9).
“The prayer of the righteous is powerful and effective” (Jas 5:16).
Are not those in heaven righteous & therefore their prayers powerful and effective?
If someone asks you to pray for them do you tell them - no, just pray to God yourself.