Whether or not an individual believes Tongues are still an active gift of the Spirit today, there is no question that the Bible does not teach that Tongues are the definitive sign that a new believer is Saved, or justified in the eyes of God. In fact, it clearly teaches that the only way this can happen (being justified before God) is based on the Obedience of Christ. (Rom 3:21-26, Rom 5:19) Tongues are not a fruit of the Spirit and they are also not to be a corporate body activity.
Notice the intense difference? Love (focused on others) vs ‘their contrived doctrine and self-focus’. (look at my intelligence and ability, you should do what I say!) So my point is, Scripture makes it clear your love for others, which produces action and behaviors that benefit others, is how you serve Christ, and one another, and is in fact, being Christian.