Just my thoughts on this thread. Raised an evangelical, we had infant baptism which I know is not biblical (some parents bypass the pressure by calling it a dedication of the child to the Lord in hopes they get baptised later). Infant baptism is not true baptism so the question should not be "rebaptized"). Consequently, I've never internalized the need for it until fairly recently in history. The more I read the bible, the more I see every convert had a water baptism. While it's not needed to be saved, it's an obedience thing that if you know you are capable, you should do it. I knew I could not face the Lord and justify not being baptized. In other words, he may save you, but keep on disobeying (showing lack of repentance) when you know better and you may not stay that way. Of course there are exceptions such as fear of the water, or being a thief on the cross. But be thankful you are not in those situations! I was completely dunked. No covering the nose allowed! So it was as if I died and rose again which is what it signifies. I gave my testimony beforehand and lightheartedly said when people ask why I waited so long after believing I said Jesus taught at age 12 but was not baptized until 30. So I was just "following the Lord" LOL. So it's never too late.
Now once baptized I take issue with some churches that claim it's not valid unless you are baptized by them, a "true" minister or whatever that means. The issue is between you and the Lord, and it conveys a public testimony of your faith -- not about the baptizer doing all sorts of rituals that they think the Holy Spirit is too impotent and useless unless the Spirit works thru them somehow (c.f. 1 Timothy 2:5). This practice of baptism is taken off the idea of the Jewish mikvah (which is what spurred my interest) in which ritual purification is complete immersion, and the Jewish person basically baptises themselves. Now for those who remember my posts, they know I'm the math/science type. For those who would question the validity of my baptism, I found later that the distance from my a certain stone from my yard (the stone I identified long before then with Christ -- a long story) to the baptismal site at the river is 12240 feet --- the same number of days Christ lived! Now one does not have to believe that, but the number is significant to me, and thus a sign from my Lord. Oh, but it does not end there. I found several astounding "coincidences" at the sight my pastor picked without my intervention. I heard some ministries say that what they preached was not done for 1900 years, or another that threw in the number 17 and then we are supposed to oooo and ahhhh like that's a miracle with one simple number. Well, let's see if any can compete with 12240? And I have other things to show so much that as Psalm 23 says, my (mathematical) cup surely overflows! Not an accident. MY POINT IS THIS when baptized, look for the Lord's verifying signs. And you can do as I did -- I washed and hung up my baptismal suit (a simple pair of swimming trunks and a T-shirt along with the service bulletin.) It becomes a tangible reminder when the enemy attacks. After all, NOBODY and I mean NOBODY goes thru such an act deceitfully unless totally evil or crazy. So it affirms your faith in the Lord, and that you repented. BTW, I threw out the smelly river sneakers. I thought to myself that was a tad much to save. LOL.