We can be "slaves to sin" and still do good of our own free will. So being a slave to sin does not negate free will.
God knows what we are going to do before we do it but that also has nothing to do with free will. Knowing what someone will do does not mean they have not chosen freely to do it.
Youi think freewill is absolute? prove your case.
If you are a slave to sin, how can you make choices independent of outside influence?
If you do any good, the outside influence is God.
Your free will is subject to some outside influence. You can not be independent of that. I had good parents, taught me right from wrong. They were a gift from God.
Lets take it further. Is God Sovereign? What does that mean to you?
and then the next question. WHY IS FREE WILL SO IMPORTANT TO YOU?
If you are haunted by anything, let it be that. WHY IS FREE WILL SO IMPORTANT TO YOU?
Lets pose it another way. Is Gods sovereignty absolute or is it limited?
If your free will is absolute, then God is not sovereign.
Any “free will” you have is subject to sin, but God is sovereign, even over the sin.
WHY IS YOUR FREE WILL SO IMPORTANT TO YOU?