These people will come back (as I stated on the other thread) when they realize that the Protestant religions do NOT have access to the Sacraments — especially the Holy Eucharist.
Surely they already know this...And it's likely the reason they left your church to begin with...
The Kingdom of God, the real church, the Spiritual church is within you...It's not in any sacrements...Millions of Holy Spirit filled Christians know this...