How can we make compatible the 'ehipassiko' aspect of the Dhamma with the faith aspects of it? In this sutta (https://www.accesstoinsight.org/tipitaka/an/an04/an04.077.than.html), it is explained that the power of Gotama Buddha as a sammasambuddha cannot or should not be conjecture about; the underlying mechanisms of kamma are not available to be investigated either. 
However, also in the suttas it is emphazised that the teachings can be tested by ourselves through practice and investigation, being that the 'ehipassiko' ("come and see") aspect of the Dhamma.

How can we conciliate those aspects of the Dhamma?

We have teachers and bhikkhus teachings about rebirth, kamma, abhijjas, the nature of Buddhas and arahants, the nature of reality, and so on, but never reaching consensus about those themes. Even within the same schools, the teachings of those topics varies from teacher to teacher.
It seems to me that Buddhism, at least in those topics, becomes a religion as the many others existent.
Are we supposed to follow blindly this part of the Dhamma?

Thanks for your time!
In this sutta (https://www.accesstoinsight.org/tipitaka/an/an04/an04.077.than.html), it is explained that the power of Gotama Buddha as a sammasambuddha cannot or should not be conjecture about; the underlying mechanisms of kamma are not available to be investigated either. However, also in the suttas it is emphazised that the teachings can be tested by ourselves through practice and investigation, being that the 'ehipassiko' ("come and see") aspect of the Dhamma.


I don't see any contradiction in the suttas. Sorta like a college math professor telling 5th graders not to conjecture about the working of calculus, differential equations, etc. But once the students have made it thru high school and into college, taking more advanced math and they'll be able to "come and see" and find out for themselves. Similarly, there're many things in the Dhamma that can be verified, some can be verified in the here and now, some would require thorough training with much dedication and effort down the line.