S.A.
I don't know much about homeschooling curriculum, but have you considered finding out if any of the private schools offer scholarships? I would think that with a 4 yo, 2 yo, 11 mo and soon to be newborn that finding time to do justice to homeschooling would be difficult.
Also, have you considered allowing your child to go to Kindergarten at a public school and talking about your concerns with the teacher and principal? I know a lot of teachers who are Christians and people of faith who are able to "answer" questions if asked but they aren't allowed to openly teach issues of faith... this could be a teaching moment for your daughter to witness to others. Also a teaching moment for you to say and explain to your daughter that not everyone believes the things that you do but that it is important for her to remember the love of Jesus? As someone else previously said, Kindergarten is about numbers, colors, etc. but it is also about social learning and it is important for your daughter to be around other kids her own age and development level instead of always being the "big sister".
Also there are groups for home schoolers who do field trips together, are involved in sporting events, and other things like play groups, etc. I don't know how you find them but my cousin home schooled and went to things like that pretty often.
Good luck with whatever direction God leads you - there are many options.
blessings,
stacy