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I didn't understand your question.<br />
Are you questioning why should anyone use SOAP when we can do the same with a REST service and return JSON?<br />
<br />
SOAP and REST services serve in-fact the same purpose but depending on how you use them, you might want to use either of them or actually both.<br />
You can even configure a WCF Service with different endpoits in order to accept both SOAP and REST calls.<br />
<br />
If I was to state one main difference between them, I would certainly mention the schema.<br />
While SOAP enforces a schema (WSDL), REST is a much looser protocol. This schema brings as many advantages as restrictions, so you really need to weight the pros and cons.<br />
<br />
I feel some frustration in your question. What's exactly your problem? :)
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I didn't understand your question.
Are you questioning why should anyone use SOAP when we can do the same with a REST service and return JSON?

SOAP and REST services serve in-fact the same purpose but depending on how you use them, you might want to use either of them or actually both.
You can even configure a WCF Service with different endpoits in order to accept both SOAP and REST calls.

If I was to state one main difference between them, I would certainly mention the schema.
While SOAP enforces a schema (WSDL), REST is a much looser protocol. This schema brings as many advantages as restrictions, so you really need to weight the pros and cons.

I feel some frustration in your question. What's exactly your problem? :)

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Why do call <b>ASMX or WCF services SOAP services </b>when they be <b>called by AJAX returning JSON</b>?<br />
<br />
Isn't that kind of confusing?
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Why do call ASMX or WCF services SOAP services when they be called by AJAX returning JSON?

Isn't that kind of confusing?

ASMX or WCF service using JSON or SOAP

Asynchronous JavaScript and XML (AJAX) is a group of interrelated Web development techniques used on the client-side to create asynchronous Web applications. With AJAX, web applications can send data to and retrieve from a server asynchronously (in the background) without interfering with the display and behavior of the existing page. HTML and CSS can be used in combination to mark up and style information. The Document Object Model (DOM) is accessed with JavaScript to dynamically display and allow interaction with the information presented.

AJAX

Windows Communication Foundation (WCF) is a tool used to implement and deploy a service-oriented architecture (SOA) to support distributed computing where services have remote consumers. It features a runtime and a set of APIs in the .NET Framework for building connected, service-oriented applications. Services typically have a WSDL interface (Web Services Description Language) that any WCF client can use to consume the service, regardless of which platform the service is hosted on. WCF implements many advanced Web services (WS) standards such as WS-Addressing, WS-ReliableMessaging, WS-Security, RSS Syndication Services, WS-Discovery, routing and better support for REST services.

JavaScript Object Notation, or JSON, is human-readable text used when transmitting data objects consisting of attribute:value pairs between a server and a web application as an alternative to XML. JSON, while it is originally derived from JavaScript, is a language-independent data format. Code for parsing and generating JSON data is available in many programming languages.

JSON

A Web service is a method of communication between two electronic devices over a network. It is a software function provided at a network address over the Web with the service always on as in the concept of utility computing. A web service has an interface described in Web Services Description Language (WSDL). Other systems interact with the Web service in a manner prescribed by its description using SOAP (Simple Object Access Protocol) messages. There are two major classes of Web services: REST-compliant web services, and Arbitrary web services.

Web Services

Simple Object Access Protocol (SOAP) is a protocol specification for exchanging structured information in the implementation of web services. It uses the XML Information Set for its message format and uses other protocols, notably Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP) for message transmission.