I have no problem with the Scriptural teaching that God calls mankind to salvation. This in no way contradicts the responsibility of man to respond to the call and accept the gift of salvation on God’s terms. If Paul was already cleansed of his sins, then why did he need them to be washed away in baptism (Acts 22:16)?
Baptism (water) is a outward sign of obedience and the inward change that takes place in Salvation.