Hari Om. Pranams.
If a person views seed as "inert" then he thinks "life" came from "inert thing" by accident so there is no God (sentient Creator). If one views seed as just "life" then the question of "what came first" becomes irrelevat because seed and tree are just two manifestations of same "life", nothing is really created so there is no creator, universe itself is mithya.
If one views seed as "a form of life inside a specific inert assembly" then there is God. It is a view that makes one see - "a seed" different than "a tree", "one seed" different than the "other seed", a "branch of a tree" different than "a leaf of a tree".
One seed has a potential to create just one tree, that too of a one particular kind. God is that seed which has infinite potentiality of creating millions of universes, millions of life forms, millions of dimensions, millions of intellects, millions of beings. He is not a supremely intelligent individuality. He is the seed of totality of the nature of supreme consciousness.
Even if we go by big bang theory which says "Universe has expanded from a primordial hot and dense initial condition at some finite time in the past" many questions still remain. Where did big bang happen? who created the primordial hot and dense matter? what existed before the time when big bang happened? Who saw it happen? Why did the expansion took place in a certain way and not any other way? Why didn't the dissolution happen instead? Everything we see has order and harmony. There is no chaos in this universe. What is holding planets in space ? Why are they not colliding with each other ? What makes them revolve with such precision? What makes plants shed leaves and sprout new leaves every season? How does a tree sprout only certain kind of leaves of certain color, with certain kind of shape and certain kind of veins drawn on them ? There is so much precision and so much intelligence filled in everything. Tell children, We call that as "God". If there was no order there would be no relativity and no Einstien. There would be no gravity and there would be no Newton. Science studies "laws of the universe". If there was chaos and no order in this universe there would be no scientists. Science uses methodologies to prove because they produce "consistent results" and not "chaos". Tell them if they still belived that the order is the result of some accidental bumping of inert matter then they are free to not belive in God.