Deut 13:1-5 (NAS)
1 "If a prophet or a dreamer of dreams arises among you and gives you a sign or a wonder,
2 and the sign or the wonder comes true, concerning which he spoke to you, saying, 'Let us go after other gods (whom you have not known) and let us serve them,'
3 you shall not listen to the words of that prophet or that dreamer of dreams; for the LORD your God is testing you to find out if you love the LORD your God with all your heart and with all your soul.
4 "You shall follow the LORD your God and fear Him; and you shall keep His commandments, listen to His voice, serve Him, and cling to Him.
5 "But that prophet or that dreamer of dreams shall be put to death, because he has counseled rebellion against the LORD your God who brought you from the land of Egypt and redeemed you from the house of slavery, to seduce you from the way in which the LORD your God commanded you to walk. So you shall purge the evil from among you.

(1) What if the prophet can do miracles but he tells us of other God's should we listen to him? (verse 1-3)
(2) Does God take the matter of this prophet lightly? (verse 5)
(3) If the teachings about God or Jesus are not the same Jesus or God as the  Bible tells us about is this following after other god's?

2 Cor 11:3-15 (NAS)
3 But I am afraid, lest as the serpent deceived Eve by his craftiness, your minds should be led astray from the simplicity and purity of devotion to Christ.
4 For if one comes and preaches another Jesus whom we have not preached, or you receive a different spirit which you have not received, or a different gospel which you have not accepted, you bear this beautifully.
5 For I consider myself not in the least inferior to the most eminent apostles.
6 But even if I am unskilled in speech, yet I am not so in knowledge; in fact, in every way we have made this evident to you in all things.
7 Or did I commit a sin in humbling myself that you might be exalted, because I preached the gospel of God to you without charge?
8 I robbed other churches, taking wages from them to serve you;
9 and when I was present with you and was in need, I was not a burden to anyone; for when the brethren came from Macedonia, they fully supplied my need, and in everything I kept myself from being a burden to you, and will continue to do so.
10 As the truth of Christ is in me, this boasting of mine will not be stopped in the regions of Achaia.
11 Why? Because I do not love you? God knows I do!
12 But what I am doing, I will continue to do, that I may cut off opportunity from those who desire an opportunity to be regarded just as we are in the matter about which they are boasting.