As a Protestant, and a Texan living close to Houston where Joel Osteen is based, I need to clarify what you are saying here.
Joel Osteen is a good motivational speaker. He is however, not a solid or faithful preacher of the Gospel of Jesus Christ. If you want to hear teaching that will lift you up, make you feel good, and almost convince you that God is some kind of celestial vending machine that will give you whatever you want if you push the right buttons, then he is the man you want to listen to…
If you want to hear truth, and solid theology from the pulpit you need to RUN as far away from Joel Osteen and his teachings…
Catholic or not, Joel Osteen’s prosperity, health and wealth so called gospel is harmful to all who fall victim to it. It is not mainstream Protestant theology any more than Unitarianism is…
If you want to hear solid Protestant teachings, seek out well studied, and biblically founded teachers such as Dr. Adrian Rogers, Dr. R.C. Spraul (I probably misspelled his name), Pastor Ron Hindt (my Pastor), Billy Graham, and others.
A good test for any religious teacher is, where do they point? Teachers that point you to God, bringing yourself to get right, and stay right with him, and proving their teaching through God’s words are typically pretty solid, but you still need to be careful, Protestant, or Catholic, there are deceivers out there that will try to snare you into a false teaching…