These all strike me as rather superficial and obvious arguments, against a caricature of Christianity. If you really want good arguments against it, you need first to make an effort to understand what Christian thinkers claim for it. No thinking supporter of Christianity would deny that of course it is built on the religious and philosophical traditions that preceded it - notably Judaism of course, but also Greek philosophy.
It seems to me the real questions are to do with:
- whether the existence of God can be disproved (many philosophers think it cannot),
- whether physicalism is the only legitimate worldview, and if so why,
- whether the core doctrines of Christianity, such as God-made-man (in the person of Christ) and the Resurrection, can be dismissed,
- whether Christianity has value as a guide to how to live one's life.
I myself have had different views on these questions, at different stages in the course of my life.