Ok.
I may have misunderstood you too, since your post was pretty brief. But I'm always concerned when "doing" anything "Christian" ... whether it's studying theology, reading the Bible, ministering in some way, etc. etc. ... makes a person feel that they cannot be bothered to pray.
Prayer is the basis of our ongoing relationship with God. Without relationship, we have nothing. Knowing all about God, if we study 20 hours a day, is worthless spiritually if we don't have a relationship. Even Christ withdrew to be alone and pray - often, and for lengths of time.
If the enemy can make us excited enough to study, to preach, or to do whatever ... that it prevents us from praying, he will gladly do it, so we need to be aware of that. It's a VERY common temptation, and one we have to be constantly aware of. I can't tell you how many preachers or ministers have fallen unknowingly into that trap, at least for a time.
I'm not saying what is happening to you ... I don't know. Just making a comment in general that this is a common thing we must guard against.
Oh, if I didn't answer you fully about "good things" ... many of us Satan can't tempt away from God by trying to get us involved in adultery, or stealing, or bullying, or something so obviously "bad" because we are no longer tempted enough by such things. But we might like to study the Bible, or go on mission trips, or help people, or preach. All "good things" certainly. So the enemy often tries to get us so involved in doing these good things that we don't take time to pray anymore. If he can cut us off from our ongoing relationship with God, our efforts won't amount to much, and we slowly weaken in our faith, without realizing it. Burnout becomes more and more common. So what I meant is that tempting Christians to overtly sin might not always work, so the enemy will subtly tempt us to get too wrapped up in doing these "good things" because we easily agree to these, if he can push us enough so that we neglect prayer, since that is his larger goal.
I hope that makes sense?