A sacrament is an outward and visible sign of an inward and spiritual grace. God gives us the sign as a means by which we receive that grace and as a tangible assurance that we do in fact receive it.
No. God’s common grace can be seen in his provision for all people. “He makes his sun rise on the evil and on the good, and sends rain on the just and on the unjust” (Matthew 5:45). However, he shows his saving grace by granting salvation to those who place their faith in Christ.