Another aspect to point to that this is false is that supposedly Christ specifically said that no one in Heaven knows anything which is happening on earth. This is specifically contradicted in 2 Maccabees when Judas Maccabeus sees Onias, who had already died, in heaven praying for the Jews along with the prophet Jeremiah:
What he saw was this: Onias, the former high priest, a noble and good man, modest in bearing, gentle in manner, distinguished in speech, and trained from childhood in all that belongs to excellence, was praying with outstretched arms for the whole Jewish community.
Then in the same way another man appeared, distinguished by his white hair and dignity, and with an air of wondrous and majestic authority.
Onias then said of him, “This is a man who loves his fellow Jews and fervently prays for the people and the holy city—the prophet of God, Jeremiah.”
(2 Mac 15:12-14)
If they didn’t know anything about what happened on earth, then how could Onias speak to Judas Maccabeus? And how would they know what to pray for?