The whole point of religion is to believe in something we can't detect through our senses or any meesly human devices. God cannot be seen, or heard, or felt, or tasted, or smelt, but we experience him. When you do good in the world, and when someone does you good, you experience God and the power of the Holy Spirit. The Lord forgives all sins, as you repent for your sins he forgives, for he is merciful.
But whatever, you win, not gonna argue over something as "silly" as religion