Did God make everything in seven days?

Yes, according to tradition. Belief in Evolution is fraught with difficulties and it remains in fact a theory, open to dispute by people who choose to avoid ignoring its problems. It can neither be proven nor demonstrated in the lab (in its broader sense of giving rise to new organs or species. See:
Is there evidence against Evolution

Can you show that God exists

God's wisdom seen in His creations

More about God's wisdom

Belief in Creation and the Torah, on the other hand, becomes more and more substantiated over time:

Does archaeology support the Hebrew Bible