Uh, no. His first miracle was livening up the marriage party at Cana by turning water into somewhat stronger beverage. And, if memory serves, he did it at his mom's request.
That's exactly what it is. :-)
"And when he had taken the book, the four beasts and four [and] twenty elders fell down before the Lamb, having every one of them harps, and golden vials full of odours, which are the prayers of saints." -Revelations 5:8
"The witnesses who have preceded us into the kingdom, [Cf. Heb 12:1 .] especially those whom the Church recognizes as saints, share in the living tradition of prayer by the example of their lives, the transmission of their writings, and their prayer today. They contemplate God, praise him and constantly care for those whom they have left on earth. When they entered into the joy of their Master, they were 'put in charge of many things.' [Cf. Mt 25:21.] Their intercession is their most exalted service to God's plan. We can and should ask them to intercede for us and for the whole world." CCC 2683
It's really quite simple. Those who have died and gone before us, hear our pleas and intercede on our behalf. Why not go directly to the Father? We do! But it is always good to have some allies in Heaven. In order for someone to be declared a saint, two miracles must be attributed to them. The Friars of the Atonement are praying to God and also asking Archbishop Sheen to 'intercede' on behalf of Terri Schiavo. Such a miracle would be credited towards his canonization. Got it?
They believe he's in heaven. There aren't any dead people in heaven. Jesus Christ himself said so.