Theological tolerance of all religions is absolutely impossible for anybody.
If you say: "You mustn't try to convert people to your religion," as if your religion is superior, what you are really saying is: "I want you to abandon your inferior view of religious truth and take my superior view".
You are essentially saying that your view of religious truth (that all religious truths are relative) is superior to my view of religious truth (that some religious truths are absolute).
You are doing the very thing you say that I shouldn't do.
Everyone has faith commitments. Believing that someone else's faith is wrong is itself a faith commitment.
You are saying - "My view of religion is superior to your view of religion".
Therefore, to say that all religions are relative is a faith commitment - that is a religion, and it is now vying with the other ones, AND is vying for superiority.
To say that you can't judge between religions is to judge between religions. To say that you can't determine between right and wrong beliefs is to determine right and wrong beliefs.