This statement does not address whether or not you are "putting the cart before the horse". In other words it does not address which comes first logically: "saving faith" or "regeneration". The verse you quote does not give a time sequence. You assume the one must first believe salvificly and then be sealed. One could be given faith and sealed concurrently.And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory.
- John 6:63 It is the Spirit who gives life; the flesh conveys no benefit [it is of no account]. The words I have spoken to you are spirit and life [providing eternal life]… 65 And He was saying, “This is the reason why I have told you that no one can come to Me unless it has been granted him [that is, unless he is enabled to do so] by the Father.”
- Acts 3:16 And on the basis of faith in His name, it is the name of Jesus which has strengthened this man whom you see and know; and the faith which comes through Him has given him this perfect health and complete wholeness in your presence.
- Romans 12:3b as God has apportioned to each a degree of faith ... God assigns faith portions
- 1 Corinthians 12:3b And no one can [really] say, Jesus is [my] Lord, except by and under the power and influence of the Holy Spirit.
- yada, yada
John 1:12-13 says faith is caused by God and then to stress the point is goes on to say FAITH does NOT come by the will of man.