At best, an unsubstantiated, hypothetical assertion. Aquinas failed to prove it, do you want to offer a proof?
I am so sorry about your loss three years ago. I know someone who had a very similar experience.
In response to your question, I would like to recommend a book and a link to you. This man, Ravi Zacharias, is much more eloquent than I. This is one of his earlier books, but it is a great read for anyone - an atheist, agnostic, or Christian.
He has written several other books as well. He has spoken at Harvard, Oxford, Yale, Cambridge, Princeton, the UN, and many other places.
His audio addresses are quite thought provoking. I believe there is a two part series he has on faith versus reason that you would enjoy hearing.
Let My People Think - Ravi Zacharias
Take good care.
He must be the first man in the entire history of humanity to prove the existence of God. /s