2Ti 4:3 For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;
2Ti 4:4 And they shall turn away their ears from the truth, and shall be turned unto fables.
2Ti 4:5 But watch thou in all things, endure afflictions, do the work of an evangelist, make full proof of thy ministry.
One Baptism by immersion and two, local church membership.
If Piper is saying that a child baptism is a legimate substitute for adult Baptism that is compromising the Baptist view on the meaning of water Baptism (identifying with the death, burial and resurrection of of Christ)
If someone doesn't understand why they need to be 'rebaptized' then it is Piper's responsiblity to explain what the Bible teaches on it.
Charles Stanley had a good lesson on it last Sunday on his T.V. station.
Don't think I am commending Stanley.
I have critcized him to my Wed. night prayer meeting/bible class as compromising on the Bible issue and walking around the platform with a Bible in his hand that he never references (a NKJ at that!)