Well, when you direct your prayers to god, are you directing your prayers to other gods? Why would it be any different if you used prayer beads in your prayers?
If the way we pray matters, why do people pray before every meal? That's not in the bible, as far as I'm aware. Does god only accept certain prayers if they are done in one very specific (culturally acceptable) way, or does god listen to prayers because people are simply communicating with him and trying to foster that relationship with him?
I'm reminded of Psalm 100...
"100 Make a joyful noise unto the Lord, all ye lands.
2 Serve the Lord with gladness: come before his presence with singing.
3 Know ye that the Lord he is God: it is he that hath made us, and not we ourselves; we are his people, and the sheep of his pasture.
4 Enter into his gates with thanksgiving, and into his courts with praise: be thankful unto him, and bless his name.
5 For the Lord is good; his mercy is everlasting; and his truth endureth to all generations."
Does god not listen if someone sings quietly? Does he not listen if people sing in Arabic, Hindi, or in some other cultural way that's understood by them? Does he not listen when someone sings in a way that's not the accepted norm? It seems to me that god could cut through that and know what's in the person's mind and heart.
Joyful noise... That noise doesn't have to sound good or acceptable to the human ear, just to god's. I don't see how prayer would be any different, but then again, I'm just an atheist.