Then please show where in scripture the teaching of the assumption of Mary is.
Deriving teaching from Scripture does mean solely from Scripture. The Assumption of Mary does indeed come from Sacred Tradition rather than Scripture but the majority of disputes between Catholics and Protestants revolve around the interpretation of Scripture. And while the Protestants may disagree with these Catholic interpretations they should, if they are honest, acknowledge that they are sincerely held by Catholics and that Catholics do not teach anything that they believe goes against Scripture. Catholics accept the authority of Scripture as just as binding as Protestants.