“So Catholics don’t trust God after He gave us an earnest that He would follow through on that?”
No, there is no guarantee in that we can’t lose our salvation. We, indeed, can lose our salvation. Hence, no guarantee. If we reject Christ, we lose our salvation.
What if you 'reject' doing HIS 'works'?
It never ceases to amaze me the answers and comments we get from Catholics. I’ll repost those verses again.
Ephesians 1:13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise, 14 Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.
Ephesians 1:13 And you also were included in Christ when you heard the word of truth, the gospel of your salvation. Having believed, you were marked in him with a seal, the promised Holy Spirit,
1 Peter 1:23 For you have been born again, not of perishable seed, but of imperishable, through the living and enduring word of God.
Notice the words I have in red? Those words should indicate to you that they are referencing those have not rejected Christ. then you come back with “if we reject Christ”? Seriously?
Those who have accepted Christ alone as their savior have been given the indwelling of the Holy Spirit as an earnest which means God made the down payment. God will not let go of what He has paid for.