For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
Some philosophers have said if there is no God, anyone is free to act and live any way they want regardless whether ethical or criminal.
Did Kant really disprove the existence of God?
Kant
No, what he really did was show the flaw in one argument, the ontological argument. This much is true. Then he tried to define all other arguments in terms of the ontological argument, which amounts to a little bit of overzealous hocus-pocus.1
The ontological argument says basically that because we can imagine a perfect Being, that therefore He must exist. It doesn't really work, and it was suggested by someone named Anselm.2
But other arguments are still good and sound. No, we probably can't strictly prove God exists, but there is evidence, and the Bible agrees.
Nietzsche
There is no need to quote Nietzsche. He took as his starting point the presumed conclusion of Kant, whom he claimed to despise.3
Everything he said after that, which was based on that starting point, therefore is invalid.4a, 4b
The Evidences
Three good evidences are the arguments from causation, from design, and from morality.
1. The arguement from first cause, (also called the cosmological argument), observes that one thing causes another, so there had to be a prime Mover. We see the universe appears both expanding and winding down, so it could not be self-existent. It had to have been created.5a, 5b
2. The argument from design, (also called the teleological argument), is really about information. The great complexity of the cell, and of the human body, and even of the fine-tuned constants of the universe, show that there is an apparent Designer. Information does not assemble by itself, and the Miller experiment doesn't come close to explaining the bustling functioning city of the cell.6a, 6b
3. The moral argument is striking in that the human notion of the difference between right and wrong cannot be explained by the natural laws of physics. As God said in His Word,
For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves: ( Romans 2:14 KJV ) 7
Conclusion
We can rest assured the God who exists is also the God of the Bible. There is such beauty in the scriptures as it explains the human condition. The Bible fits the facts of creation better than the other so-called holy books, by a long mile.8
1 https://reasonablefaithadelaide.org.au/kants-critique-of-the-traditional-arguments-for-the-existence-of-god/
2 https://en.wikipedia.org/wiki/Ontological_argument
3 Nietzsche's Radicalization of Kant
4a https://en.wikipedia.org/wiki/God_is_dead
4b Psalm 14:1
5a https://en.wikipedia.org/wiki/Cosmological_argument
5b Genesis 1:1
6a https://en.wikipedia.org/wiki/Teleological_argument
6b Romans 1:20
7 https://en.wikipedia.org/wiki/Argument_from_morality
8 How is the Bible unique?
(All scriptures quoted from the KJV.)
All things are from and to our Lord Jesus Christ, to Whom is all glory due forever.