Welcome to our debate forum, willietdog.
2.How can there be light before there is a source?
Genesis 1 presents a primitive pre-scientific account of the world. It describes the sky as a rigid ceiling (firmament). It describes this sky as being luminous during the day but not at night. This luminosity is created with "let there be light", and is independent of the sun. That is, the light in the sky is its own source.
As you point out, the sun, moon, stars were created later. They are described as some sort of lighting fixtures installed in the ceiling.
The account indicates that there is water above the ceiling, presumably the source of rain.
This is, of course, complete nonsense to us, given our scientific knowledge. However, it is a quite natural and simple description for the primitive people for whom this account of creation was intended.
Creationists are in total denial of this. Though they claim to be literalists, they insist on nonliteral readings of this text so that they can delude themselves that it is not hopelessly wrong.
Let's end the political smears