Give to the Lord the glory due His name; bring an offering, and come before Him. Oh, worship the Lord in the beauty of holiness!—1 Chronicles 16:29
There is nothing intrinsically wrong with signing a card. It can be a helpful thing so we know who has made inquiry.
But really, my brother or sister, we are brought to God and to faith and to salvation that we might worship and adore Him. We do not come to God that we might be automatic Christians, cookie-cutter Christians, Christians stamped out with a die.
God has provided His salvation that we might be, individually and personally, vibrant children of God, loving God with all our hearts and worshiping Him in the beauty of holiness. Whatever Happened to Worship? p. 14
"Lord, I don't need another name in my file, another notch on my belt. But I would like the privilege today of bringing someone to the point of salvation so he could become a genuine worshiper of You. Use me today, I pray, in Jesus' name. Amen."