Give a biblical response to today's religions

Jude 3 "...ye should earnestly contend for the faith which was once delivered unto the saints."

1Pe 3:15  "But sanctify the Lord God in your hearts: and be ready always to give an answer to every man that asketh you a reason of the hope that is in you with meekness and fear."

Eph 5:11 "Take no part in the unfruitful works of darkness, but instead expose them."

Titus 3:10 "A man that is an heretick after the first and second admonition reject."