“Post your evidence that they can and do hear your prayers.”
Seriously. Go read the doctrine. You say they are separate things, they are not.
Doctine without a Biblical basis is false doctrine. Reading unsupported truth claims is not evidence, it is simply opinion.
We agree Saints are alive in heaven. The Bible says so.
Show me your evidence that proves they hear us, interact with us, pray for us.
It does not exist.