After having this long debate, I begin to see two main groups who disagree with mid Acts dispensationalism.
One group is one that believed that it has always been by grace thru faith in Christ, apart from works ever since the fall of Adam. This is the covenant theology doctrine. For example, they believe that, even during the 4 gospels, believing in Jesus alone is sufficient for salvation.
To back up this doctrine, they simply quote verses that "seem" to imply that belief in Jesus is all that is required, for example the ever popular John 3:16, and ignore all other verses when Jesus talked about following the Law of Moses, or simply interpret all those passages in the light of Pauline doctrine,
Another group is like you, one who insist that everyone must try their best to keep the Law, along with belief in Jesus.
To back up this doctrine you would make sure to quote the OT, all the verses in the 4 Gospels that Jesus talked about following the Law, as well as all the passages in 1 John that emphasize the same doctrine.