"All major religions are equally valid and basically teach the same thing." | To assert that the doctrinal differences between religions are insignificant is itself a doctrine, and one that is indefensible. |
"Each religion sees part of spiritual truth, but none can see the whole truth. " | From what absolute vantage point can you claim to relativize the absolute claims of the different scriptures? |
"Religious belief is too culturally and historically conditioned to be 'truth'" | If you say "no belief can be held as universally true for everyone", then by your own rules you can't say that this statement is universally true. |
"It is arrogant to insist your religion is right and to convert others to it." | If you say "all religious claims to have a better view of things are arrogant and wrong", then by your own rules that statement is arrogant and wrong. |
H/T: This university website