All Christians go to Heaven at the same time. In the Rapture. Jesus is at the right hand of God interceding for us until the Rapture. Jesus was asked twice how we should pray: both times he said: Our Father who art in Heaven. There is no praying to Saints, to Mary or anyone else.
You are welcome to believe you can pray to someone else but you would be ignoring the Scriptures...
Paul called ALL Christians Saints.
Nope. Read revelations. The saints offer the prayers of the faithful to God using the imagery of incense.
Your statement also goes again 2000 years of Church teaching. You’re wrong.