God is a God that uses unlikely people to accomplish his purposes and these people, because of God’s love of you, will bless you. Now it also comes down to God’s purpose that is larger than just us. But if we can get our minds around the idea that just because a person is not a believer in God doesn’t mean God won’t and is not using them.
If people who do bad things can impact you to the negative, it’s just natural progression that those who do good things will impact you to the good.