The verse that is being referenced is Romans 10: 13 [For whosoever shall call upon the name of the Lord shall be saved.] Some are saying all you have to do is call on the Lord and you shall be saved.
But what about Romans 10: 8 [But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach; 9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.] Here it shows that they have received the word and believe in the heart that Christ rose from the dead. Verse 13 above follows verse 8&9 showing that there is more than just calling on His name.
In Romans 10:10 [For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. 11 For the scripture saith, Whosoever believeth on him shall not be ashamed.] it furthers shows that action is required from the heart, mouth and then not to be ashamed. An outward showing of salvation is that we are not ashamed.
In Romans 10:14 [How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?]
it is necessary that they have heard the Gospel. Just calling on the Lord without hearing the Gospel cannot guarantee salvation.
Romans 10: 17 [So then faith cometh by hearing, and hearing by the word of God.]
One thing that is important to remember is that the reason Paul said this is in Romans 10:3 [For they being ignorant of God's righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteousness of God.] God expects us to submit to His righteousness. Being saved doesn't give us license to go outside of God's Word. That doesn't mean we are bound by OT law but we are bound to believe in God's Word because it was through hearing His Word that we got saved in the first place.
And if after all this you think you can believe in Romans 10:13 and believe in evolution, I say then you must believe in the entire book of Romans starting with Romans 1:16 [For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek. 17 For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith.]
But to all who hold God's truth in unrighteousness- Romans 1: 18 [For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness; 19 Because that which may be known of God is manifest in them; for God hath shewed it unto them.]
Then if you read the rest of the chapter you will see that God is the creator and all sorts of other things that will help you in your faith towards the Almighty God!!