You should question everything anyone is telling you. The world is filled with liars. I am a liar, you are a liar and so is everyone else. You must find a way to get to the truth test that method and go only by it. Everyone else will deceive you, hurt you and destroy you. Most of all "spiritual leaders." They will tell you a different story though- they will tell you they have the one truth. I'd do the same thing if I were about to stab you in the back.
I think we should listen closely to the ones we know are well versed in their subject and faith but also keep in mind that they are also humans and can occasionally make a mistake. We should also study on our own and stay in close contact with the Source of our faith in order to be sure we arent being mislead by misinformation either intetionally or unintentionally because we know that the Enemy uses others, occasionally even our leaders, to decieve us into believing its lies. There are certain Christian leaders i would believe without doubt, Billy Graham, Luis Palau and Anthony Campolo are three of them. Id throw in my church pastors as well tho they have occasionally said things i do not agree with. What im saying, i guess, is that many leaders are called to do what they do and give information they believe to be correct but, being human, can themselves be mislead if they arent attentive enough, so we should trust them but not blindly without question. We should ALWAYS be in direct daily contact with the Source so as not to be mislead ourselves.
It's perfectly fine to question things you are learning. Any religious leader that teaches Bible truths should always use the Bible in their teachings. If you have a question about what you're learning, look to the Bible for the answers. Most likely from doing that, you'll be able to recognize whether or not what they're saying is accurate and true. (2 Timothy 3:16,17)
Better to ask the Holy Spirit and read the Bible. I have a special place in my comfort for that list of words on the back of the Bible that you look up a word there and it gives you where to find that word in the Bible. Online keyword search at www.biblegateway.com and, well, recently I ve been showed that today, there are many Bibles that are coming out to deceive people. So, I recommend the King James Version to be the Bible you get for yourself (or for anyone else).
If you are expecting to learn what the Bible teaches and have questions the person who you feel is your " spiritual leader" should be able to show you from the Bible the answers to your questions. They may not be able to tell you at the instant but they should be getting back with you after carefully researching the scriptures that relate to your question. Asking questions is a great way to find out and you should do research yourself. If for example you have a question about death , then use a concordance like book that separates Scriptures by subject and read the texts about death. Acts 17: 10-12 says "Immediately by night the brothers sent both Paul and Silas out to Be·roe?a, and these, upon arriving, went into the synagogue of the Jews. Now the latter were more noble-minded than those in Thes·sa·lo·ni?ca, for they received the word with the greatest eagerness of mind, carefully examining the Scriptures daily as to whether these things were so. Therefore many of them became believers, and so did not a few of the reputable Greek women and of the men" The Beroeans heard what Paul was teaching, but examined for themselves before they put faith in it.