People who reject Paul's letters because they seem to be counter to Torah are victims of one of two groups of false witnesses concerning Paul:
1. The same who accused Paul of teaching against Moses in the first century. They were wrong then and they're wrong today. They have misunderstood Paul's rejection of anti-Torah traditions as a rejection of Torah itself.
2. Antinomians and Marcionists who themselves reject Torah and twist Paul's writings in support of their own errors.
Don't do that.
Read Paul as if he was a Jewish rabbi more or less in line with the Pharisees of his day, because that's how he defined himself. You will be amazed at how the apparent contradictions between his letters automagically resolve themselves.