【如果你这么想的话，我不反对】英文怎么说？

这个要用虚拟语气，是高三英语课本的一大章节
1，对过去的虚拟 If从句用had +done 主句用have done
2，对现在的虚拟 if从句用did 主句用would/could + do
3，对将来的虚拟if从句用were to do /did /would do .而主句用 could +do
你的语境应该是对现在的虚拟。
所以 应该是 If you thought so , i would not object you opinion.
就是if从句用did 主句用would/could + do

If you think so, I don't mind

As if you think so,I'm with you.