One general rule that will surprise almost no one is that non-Theists make poor theologians. There are, of course, several exceptions, but the overwhelming majority of unbelievers, particularly atheists, seem to understand theology about as well as you might expect a high school student to.
To illustrate this, consider the number of atheists who use free will to justify radical Liberalism. When a Christian preaches against homosexuality, transgenderism, or abortion, many atheists might say to that Christian "God is obviously ok with these things, because He gave us free will".
First, note the hypocrisy. This logic is never used for the sins the atheist doesn't like. In fact, the same atheists who use it are often very much opposed to Christians preaching against their favourite sins. I was even recently told by one such atheist that I have no right to preach the things I do. So which is it? Is free will an excuse for depravity, or should I forfeit my freedom to preach? It can't be both.
Of course, in reality, the answer is neither, because free will is not, nor has it ever been, about the right to sin. Rather, it is about the ability to make a true choice as opposed to a forced, pre-programmed choice. This is because a good choice made freely is superior to a good non-choice. Think about it: Do you thank an automatic door as much as you might thank a stranger who opens a door for you?
God did create us with free will, but free will is anything but free. Along with the ability to make good choices comes the ability to make bad choices. But we have been explicitly commanded not to. Nevertheless, we do, and so we have also been commanded to repent of those.
Unfortunately, even with repentance, a price must be paid. And so it was, by the death of the Lord Jesus Christ, as opposed to the death of the faithful sinner. But what of the impenitent sinner? Sadly, their debt is returned to them.
And so we see that free will is not an excuse for sin. Rather, sin must be paid for by either the sinner, or the Lord. The question you need to ask is how deep are your pockets? Can you afford to pay the price for the sins you choose to commit?