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Absolutely not. Whoever taught you that, CynicalBear, was flat-out lying to you. It is a complete fiction.
Read this carefully: Any form of prayer you Protestants can use, Catholics also can (and do) use. In addition to that, we can ask others to pray for us (both other living Christians, and those who have passed on).
God does not need any "intecessory" prayers to act, or any "middlemen" or "middlewomen". However, God often chooses (in His Sovereign Holy Will) to use human beings as "middlemen/middlewomen".
For example, if God wanted to, He could easily tell each of us everything that is contained in, say, the Bible Book of "Luke", but He chose instead to use a middleman (Luke) to write that Gospel, and pass on His information to each one of us who access that Gospel.
(God didn't need to do that, but He chose to do that, and actually takes great delight in using humble human servants to do things for Him, even though He does not need them to do those things at all.)
It is an absolutely wonderful thing to pray for other humans in need, and it does not stop being a wonderful thing for people who made it to heaven to keep on praying for other human beings in need.
Please don't play that game with me. Catholics are NOT just asking their so called saints to pray. They pray TO them to have them perform specific acts. Catholics also tell us those so called saints or Mary have more influence. They claim only those proclaimed by the CC are saints. Then they tell us it's those saints that present the prayers. If only saints present prayers to God and you are not a saint God must not hear your prayers unless they go through saints. It's all double speak.
Communicating with those who have passed from this life is not supported by but is condemned in scripture. Communicating with those who have passed from this world is only found in paganism.
Between us, there is NO disagreement with THIS statement.
Where we diverge is when you guys pray TO dead people!