I firmly hold that it is not biblical and that to pray to anyone other than God is idolatrous.
I’m just lurking here but I would like to chime in and say that to pray is an old word which simply means to “ask.” And no not all prayer is worship. To show you my point I’ll use examples from the King James Bible.
Genesis 13:8
And Abram said unto Lot, Let there be no strife, I PRAY THEE, between me and thee, and between my herdmen and thy herdmen; for we be brethren.
Lot was a creature of God, Did Abram commit and act of idolatry? Did Abram worship Lot because he prayed to him?
Genesis 25:30
And Esau said to Jacob, Feed me, I PRAY THEE, with that same red pottage; for I am faint: therefore was his name called Edom.
Again Jacob was a creature of God. So did Esau commit an act of idolatry by praying to Jaco?
Here is an interesting one:
Here is one where Jesus prayed to Simon.
Luke 5: 1-5
And it came to pass, that, as the people pressed upon him to hear the word of God, he stood by the lake of Gennesaret,
2 And saw two ships standing by the lake: but the fishermen were gone out of them, and were washing their nets.
3 And he entered into one of the ships, which was Simon’s, and PRAYED HIM that he would thrust out a little from the land. And he sat down, and taught the people out of the ship.
4 Now when he had left speaking, he said unto Simon, Launch out into the deep, and let down your nets for a draught.
5 And Simon answering said unto him, Master, we have toiled all the night, and have taken nothing: nevertheless at thy word I will let down the net.
Surely you don’t believe that Jesus worshiped Simon because he prayed to Simon to let out his ship from the land? But these verses do show that Jesus did pray to Simon. So was Jesus commiting an act of idolatry. Or is your understand of the word “pray” a little eschewed and in error? Like I said to pray is an old word which simply means to ask. And no I don’t believe that all prayer is worship.