I'm a bit out of touch, having been away from home for a while, and I am not minded to trawl through all the longish posts that have appeared in that time. Could we possibly agree on two matters: (1) that the early Christians required both faith and baptism for a full Christianity, and (2) that it is not in itself wrong to baptise a person after he comes to faith? You require faith in Jesus Christ to follow baptism (except of course of older converts from Islam or wherever); we require faith to precede baptism. Even if, therefore, you are right to baptise infants, it does not make us wrong to baptise believers.
The only baptism we as Baptists see specifically mentioned in scripture is that of people when they come to faith. Therefore, it is what we practise. I do not see how we can be wrong to do so.
Seeing also that God has abundantly blessed multitudes of pædobaptists down the centuries, and is still manifestly doing so, I am content to leave the matter of your practice with you and God. For me, my conscience has allowed me to baptise only those who profess faith that Jesus is Lord.