ANSWER:

This is not permissible. We must not help people acquire deviant aqeedah even if there is goodness in other aspects as well. 

https://islamqa.info/en/answers/39349/mixing-with-the-tableeghi-jamaat-and-going-out-with-them

Shaikh,here i see a lot of people who were worshipping grave,drink alcohol,auto rickshaw puller, start praying namaz bcoz of tableeghi jamaat (though they have some deviance)but their is a lot of khair for those who don’t pray salah at all or who lacks Islamic knowledge at all,can they be advised to go in jamaat?(Their is some extreme critisim of them which is not true)