This is not what the Church teaches.
This is what you think Catholics believe.
We ask the saints to pray for us because God wills us to pray for each other --to intercede for each other. Because we are all part of the Body of Christ.
Intercessory prayer is mentioned many times in Scripture.
2 Corinthians 1:11Nothing can separate us from the love of God or divide the Body of Christ. And so the saints in heaven offer our prayers to God.you also joining in helping us through your prayers, so that thanks may be given by many persons on our behalf for the favor bestowed on us through the prayers of many.
Philippians 1:19
for I know that this will turn out for my deliverance through your prayers and the provision of the Spirit of Jesus Christ,
Psalms 122:6
Pray for the peace of Jerusalem: "May they prosper who love you.
Isaiah 62:6-7
On your walls, O Jerusalem, I have appointed watchmen; All day and all night they will never keep silent You who remind the LORD, take no rest for yourselves; And give Him no rest until He establishes And makes Jerusalem a praise in the earth.
Ephesians 6:18
With all prayer and petition pray at all times in the Spirit, and with this in view, be on the alert with all perseverance and petition for all the saints,
1 Timothy 2:1
First of all, then, I urge that entreaties and prayers, petitions and thanksgivings, be made on behalf of all men,
Rev. 5:8And when he had taken it, the four living creatures and the twenty-four elders fell down before the Lamb. Each one had a harp and they were holding golden bowls full of incense, which are the prayers of God’s people.