Romans 16:17 does not address infant baptism. You are removing the verse from its context. The immediately following verse, Romans 16:18, reads: ‘For such people are not serving our Lord Christ, but their own appetites. By smooth talk and flattery they deceive the minds of naïve people.’ It seems extremely forced, and even rather offensive, to apply these words to supporters of infant baptism.
Titus 2:9, though not explicitly, seems to suggest something like that: ‘But avoid foolish controversies and genealogies and arguments and quarrels about the law, because these are unprofitable and useless.’ Clearly, there are issues we should avoid, because they are of little importance. Whether infant baptism is one of them is questionable (I personally am reluctant to pronounce it a minor issue, because it is very important for me, but I am also reluctant to pronounce it a major one, because I think that anyone can still be a Christian though he may accept infant baptism — that is why I said it depends on your definition).
However, I assume both you and I would agree that doctrines like Calvinism and Arminianism, or like Cessationism and Continuationism, or like Young Earth and Old Earth, which somehow divide the church today, are essentially minor. You would not force anyone to agree with you in these issues in order to accept him as a Christian, would you?
Doubtless. But that does not necessarily make it essential for the Christian faith.
So, you think that the Baptists are the only correct denomination, and that all others are wrong, and that only Baptists can be Christians? OK. So, you are against denominations, because you believe in only one denomination: the Baptists. Is that it? OK.