I suppose I wasn't. By the time dispensationalism was explained to me it was all I could do not to laugh out loud.
And this is typical of everyone who "used to believe____________ but now have the truth."
It is a false assertion we see often on the forums. The greatest example are Atheists who, like you claimed to once being an IFB, say, "I used to be a Christian...but now I am not."
The veracity of the assertion is shown to be false when we examine their doctrine. In your case, it is a rejection of fundamental truths which suggest that perhaps your time as an IFB was one of, not association by agreement in Doctrine, but, one of skepticism. And the fundamental issue that arises in every instance we see this is one thing: they claim to have been a part of that group but they do not even know what that group teaches. They claim to, then go on to present false arguments like you do.
Many people think they were once Christian because they grew up in a fellowship. They, like you, fought a battle with skepticism concerning that which they were exposed to, and the root problem was rejection, not an acknowledgement that what the group taught was truth. Not an understanding of what that group actually taught.
Here is an example: I use to believe in Eternal Security, but, I have been shown the truth. Unlike those who believe in Eternal Security, we know the Bible doesn't teach license to sin.
And what shows me that they did not once believe in Eternal Security is their understanding of Eternal Security as expressed in their statement. Eternal Security is not, and does not teach that we are eternally secure therefore we have license to sin. This is a false doctrine not associated with credible teaching on Eternal Security, nor, I will add, do we find any credible adherents teaching this. It is a false argument.
But I appreciate you being honest about this, because few are. They are shown why the basis for their "belief" is in error, yet refuse to acknowledge that error. For you, Bob, you are going to need to actually address the points made. Confidence in our doctrine allows us to examine each argument and provide a response.
Now, as I have said, your rejection of Paul is not all that you reject. You are also rejecting the clear statements of Christ, Luke, Pete, John, and James.
Now what does that leave you with Bob?
And with what you have left, is this a reasonable foundation for a claim to being in Christ Jesus? Shall we suppose that God is now saving men through extra biblical concepts and teachings? Rather than the Word of God?
God bless.