One of the most difficult thing for me to understand is the idea that Baptism is something that God does rather than something that we do. When I was an RC kid, I never been reminded of my baptism, perhaps I was just ignorant but maybe the RCC really do, but not by my impression. In fact I asked my RC friend and he told me the same. That is something in the past. Then when I became a pentecostal, that was the same too, it is put away in the shelve and never recalled, but that is not true in the Lutheran understanding of baptism. Each start of the service, you start it off by recalling it - In the name of the Father, the Son and the Holy Spirit.
Then I kept on going back to the Gospel and the doctrine of justification and once we see that justification is a gift, then it is no longer hard to see that Baptism and the Lord's Supper is not a thing we do but gifts that God gives which are connected to the gift of forgiveness of sins in Christ, at the Cross. It is the same Gospel of 2000 years ago. The Baptist certainly would find this weird. I know I did. It sounds weird because they look at Baptism as an ordinance, a command, rather than a gift. No point discussing the mode, or candidates for baptism, you gotta discuss first the nature of the Gospel ie justification. Now that is also weird - to some.
No wonder it was difficult for me to get it because somewhere in my growth, I was made to focus on the Gospel as a demand rather than a declaration. So I go to church to receive God's gifts, what a nice deal.