Imam's beliefs are doubtful

I am suspicious about **Imam's beliefs** regarding (Walee Ullah). His saying about pious people (Walee Ullah) is that they are closer to GOD. So ask them to pray for you instead pray directly. He put example that "my son is in bank and bank official will give more importance to my work if my son ask them to do that work, otherwise they will not listen to me". On Juma prayer he use to discuss minor contradictions in beliefs of "Deoband Followers" and "Bralli Followers" and make fun of "Deoband Followers", I want to know I am doubtful about his basic beliefs regarding GOD's "oneness" and about "Holly Prophet's Death" should I offer my prayer in his imam-at? Will Such prayer be accepted in front of GOD. With answer please mention **reference**.