Do not marvel at all but beware of false gospels
I don’t get into any wonder when so many people are living in deception. As they accept the lies of the Devil and reject the truth from God. It’s a very foolish thing to take in false gospels and still expect to go to heaven. The verse which says “Satan disguises himself as an angel of light” usually is used to warn us against the Devil. Indeed one must be on guard against this hellish serpent who is going to judged most severely on Judgement Day. Now to make your understanding more complete read the verses before the part where it mentions Satan appearing like an angel of light and it you will realize that the chapter of 2 Corinthians 11 is much more than warning about Satan alone.
This is a warning about false Gospels, false spirits and false men who claim to be servants of God. Satan is not alone in his gambit of deception, he will try to appear to lose to a few doctrine’ just so that you go off guard and then accept his lie. Some false gospels do speak against worship of idols but permit adultery. While other’s speak of repentance but do not warn against falling into sin later on. Some gospels acknowledge Jesus Christ but deviate from what the Bible says about him.
The main trick of false gospels it to have a percentage of deception mixed with truth but enough deception to keep you away from believing the true Gospel and serving the Lord God. It’s like a small drop of poison which is enough to kill a fully grown lion. Here are the verses of 2 Corinthians 11: 1-15 that you can reflect on:
11 I wish you would bear with me in a little foolishness. Do bear with me! 2 For I feel a divine jealousy for you, since I betrothed you to one husband, to present you as a pure virgin to Christ. 3 But I am afraid that as the serpent deceived Eve by his cunning, your thoughts will be led astray from a sincere and pure devotion to Christ. 4 For if someone comes and proclaims another Jesus than the one we proclaimed, or if you receive a different spirit from the one you received, or if you accept a different gospel from the one you accepted, you put up with it readily enough. 5 Indeed, I consider that I am not in the least inferior to these super-apostles. 6 Even if I am unskilled in speaking, I am not so in knowledge; indeed, in every way we have made this plain to you in all things.
7 Or did I commit a sin in humbling myself so that you might be exalted, because I preached God’s gospel to you free of charge? 8 I robbed other churches by accepting support from them in order to serve you. 9 And when I was with you and was in need, I did not burden anyone, for the brothers who came from Macedonia supplied my need. So I refrained and will refrain from burdening you in any way. 10 As the truth of Christ is in me, this boasting of mine will not be silenced in the regions of Achaia. 11 And why? Because I do not love you? God knows I do!
12 And what I am doing I will continue to do, in order to undermine the claim of those who would like to claim that in their boasted mission they work on the same terms as we do. 13 For such men are false apostles, deceitful workmen, disguising themselves as apostles of Christ. 14 And no wonder, for even Satan disguises himself as an angel of light. 15 So it is no surprise if his servants, also, disguise themselves as servants of righteousness. Their end will correspond to their deeds.