As a writer you don't have to be good at writing grammatically.
aalbc.com has services which can assist you with that when you are ready to make that next step happen.
After reading your post.
It is only right to inform you. That you, yourself, personally, must develop the book, before handing it off for someone else to research and then write as addendum or even as support.
Have more confidence in what you know, and make the effort to know that what you are sharing is accurate.
This is, after-all, your intellectual property.
Which, in a nutshell, means that you are the most qualified person to develop this process.
Were I, or anyone else to takeover as the writer, the book would immediately end being whatever it is you wanted it to be.
Books are works of art. As unique as the writer. With styles and class that cannot be duplicated, recreated, or copied very well by another.
All styles of writing do not go together.
Develop your work through diligent consistency.
Read books about evolution and creation. Chemistry and biology.
You don't need to read the entire books. Begin by reading in chemistry how that applies to your description of events.
Begin in biology by matching the sequence of life development to your description.
be careful not to cherrypick and omit. That will only reveal that you are a liar. You have clearly stated you are not a liar, so be careful in that area.
Lastly, Don't look for a quick fix. When you meet information that doesn't jive with what you would like to present. Then it is TIME to begin experiments. Don't deny what your own senses are taking in. You are going to find that most writing is concluded from research and experiments.
Don't be afraid to admit defeat, or that you are wrong. EQUALLY. Don't be afraid to gloat when you are right. One or two I told you so, is okay too.
I myself am new on this site. Not even one month in.
I cannot wait for you to publish your work.
Stick around.
If you came here specifically to ask for help and you get no takers its all good. Now you know why. Its in this comment.
You've got nothing to lose and a whole lot to gain.