How do I know God

A perfect creation in the universe shows the power of God the Most Great.
God himself has introduced Himself to us through the Qur'an - revelation to man as the true guide for life. All the properties of the glorious God conveyed to us in the Qur'an. He is the Wise, All-Knowing, Most Gracious, Most Merciful, Most Just, All-Covering the whole of nature, and the Hearer, the Seer of all things. He is the owner and the only God of heaven and earth and everything in between. He is the ruler of the kingdom of heaven and earth.

He is Allah - there is no god but Him. He knows the Unseen and the Visible. He is the Compassionate, the Merciful. He is Allah - there is no god but Him. . . . Hers all good names. Everything in the heavens and the earth glorify Him. He is Mighty, Wise. (Surat al-Hasr: 22-24)